问题如下图：
选项：
A. 
B. 
C. 
老师，能不能麻烦讲一下B选项？不太记得在哪里出现过了 解释：
NO.PZ2018062020000034 问题如下 The C tranche witha cret rating status between senior ansubornatebonclasses is callethe: A.equity tranche. B.resitranche. C.mezzanine tranche. C is correct.The mezzanine tranche consists of bonclasses with cret ratings between senior ansubornatebonclasses.A isincorrebecause the equity tranche falls within ancarries the cret rating applicable to the subornatebonlasses.B isincorrebecause the resitranche falls within ancarries the cret ratings applicable to the subornatebonlasses.考点C tranche 解析A、B都是次级层级的意思，在分层结构中处于最后一层，收到的是剩余现金流。而C处于senior和subornate级之间，故正确。 subornate也可以叫做equity 吗
resitranche. mezzanine tranche. C is correct.The mezzanine tranche consists of bonclasses with cret ratings between senior ansubornatebonclasses. A isincorrebecause the equity tranche falls within ancarries the cret rating applicable to the subornatebonlasses. B isincorrebecause the resitranche falls within ancarries the cret ratings applicable to the subornatebonlasses.老师这个知识点可以再列一下吗？完全没印象，麻烦把题目也解析下，谢谢
