问题如下图：
选项：
A. 
B. 
C. 
解释：
long CDX等于selling protection？ 和课程里的解释不一样吗？
NO.PZ201712110200000508 问题如下 The curve tra thwoulbest capitalize on Chan’s view of the US cret curve is to: A.buy protection using a 20-yeC anbuy protection using a 2-yeC. B.buy protection using a 20-yeC ansell protection using a 2-yeC. C.sell protection using a 20-yeC anbuy protection using a 2-yeC. B is correct.To take aantage of Chan’s view of the US cret curve steepening in the short term, a curve tra will entail shorting (buying protection using) a long-term (20-year) C angoing long (selling protection using) a shortterm (2-year) C. A steeper curve means thlong-term cret risk increases relative to short-term cret risk. steepening是向上倾斜还是向下倾斜
capitalize on her short-term view of a steepening of the US cret curve. 从题目来看，也就是说，short-term spre变大，那么buy protection， short position。 答案是不是有误？
此题是否答案有误？不是选B吗
被术语short和long搞糊涂了长期风险变大，应该买long-term C，卖出short-term C, 按照答案，买进是“short”,卖出是“long”?
Buy protection 不是应该 long C吗？ 怎么成short了？要short也应该是bon是C啊。同理，为什么sell protection又成go long C了？
