c为什么不对 和D不就是反过来吗

问题如下：

What is a forward bucket 01?

选项：

A.

The decrease in the value of a portfolio when a specific forward rate is increased by one basis point.

B.

The increase in the value of a portfolio when a specific forward rate is decreased by one basis point.

C.

The increase in the value of a portfolio when all the forward rates within a particular bucket are decreased by one basis point.

D.

The decrease in the value of a portfolio when all the forward rates within a particular bucket (i.e., all the forward rates corresponding to a particular range of maturities) are increased by one basis point.

解释：

A forward bucket 01 is the decrease in the value of a portfolio when all the forward rates within a particular bucket (i.e., all the forward rates corresponding to a particular range of maturities) are increased by one basis point.

题目问：什么是forward bucket 01？

当特定的bucket里的所有的forward rate上升1bp，所导致value的下降。