选项a,c,d不是很懂，麻烦老师帮忙看一下，谢谢
问题如下图：
选项：
A. 
B. 
C. 
D. 
解释：
orange品职答疑助手 · 2018年03月27日
A选项：当利率上升时，债券价格下降（只有利率很低时，发行者才会购回债券，价格与利率才会呈现负凸的图像）
C选项：puttable bond中的put 赋予了投资者在利率上升债券价格下跌时，将债券以一定价格强制卖回给发行人的权利，这对投资者是有利的，那么当然puttable bond相比于普通债券会卖的更贵，所以收益率更低
D选项：逆向利率浮动证券(Inverse Floater)是一种息票利率coupon rate与市场利率成反方向变化的浮动利率证券。所以，当市场利率上升时，coupon rate会下降，即每期的现金流下降，inverse floater的价格会下降。
NO.PZ2016082402000044问题如下 With any other factors remaining unchange whiof the following statements regarng bon is not vali The priof a callable bonincreases when interest rates increase. Issuance of a callable bonis equivalent to a short position in a straight bonplus a long call option on the bonprice. The put feature in a puttable bonlowers its yielcomparewith the yielof an equivalent straight bon The priof inverse floater creases interest rates increase. ANSWER: A Answer B is valid because a short position in a callable bonis the same a short position in a straight bonplus a long position in a call (the issuer ccall the bond back). Answer C is valibecause a put is favorable for the investor, so it lowers the yiel Answer is valibecause inverse floater hhigh ration. 为什么A错了，不太明白
NO.PZ2016082402000044 With any other factors remaining unchange whiof the following statements regarng bon is not vali The priof a callable bonincreases when interest rates increase. Issuanof a callable bonis equivalent to a short position in a straight bonplus a long call option on the bonprice. The put feature in a puttable bonlowers its yielcomparewith the yielof equivalent straight bon The priof inverse floater creases interest rates increase. ANSWER: A Answer B is valibecause a short position in a callable bonis the same a short position in a straight bonplus a long position in a call (the issuer ccall the bonback). Answer C is valibecause a put is favorable for the investor, so it lowers the yiel Answer is valibecause inverse floater hhigh ration. callable bon和 coverecall 一样吗，有什么区别吗。还有为什么callable bon于short bon+long call呢，我画了图，他们两个相加应该是long put那个图形吧
NO.PZ2016082402000044 With any other factors remaining unchange whiof the following statements regarng bon is not vali The priof a callable bonincreases when interest rates increase. Issuanof a callable bonis equivalent to a short position in a straight bonplus a long call option on the bonprice. The put feature in a puttable bonlowers its yielcomparewith the yielof equivalent straight bon The priof inverse floater creases interest rates increase. ANSWER: A Answer B is valibecause a short position in a callable bonis the same a short position in a straight bonplus a long position in a call (the issuer ccall the bonback). Answer C is valibecause a put is favorable for the investor, so it lowers the yiel Answer is valibecause inverse floater hhigh ration. B 的issuranof a callable不是 long callable的意思吗。
Issuanof a callable bonis equivalent to a short position in a straight bonplus a long call option on the bonprice. The put feature in a puttable bonlowers its yielcomparewith the yielof equivalent straight bon The priof inverse floater creases interest rates increase. ANSWER: A Answer B is valibecause a short position in a callable bonis the same a short position in a straight bonplus a long position in a call (the issuer ccall the bonback). Answer C is valibecause a put is favorable for the investor, so it lowers the yiel Answer is valibecause inverse floater hhigh ration. 逆浮动的久期为什么更长？？？？？
With any other factors remaining unchange whiof the following statements regarng bon is not vali The priof a callable bonincreases when interest rates increase. Issuanof a callable bonis equivalent to a short position in a straight bonplus a long call option on the bonprice. The put feature in a puttable bonlowers its yielcomparewith the yielof equivalent straight bon The priof inverse floater creases interest rates increase. ANSWER: A Answer B is valibecause a short position in a callable bonis the same a short position in a straight bonplus a long position in a call (the issuer ccall the bonback). Answer C is valibecause a put is favorable for the investor, so it lowers the yiel Answer is valibecause inverse floater hhigh ration. 能下 啥是逆浮动债券吗