NO.PZ2023090201000135
问题如下：
For an option-free fixed-rate corporate bond, the duration and convexity statistics are most likely relevant for a change in:
选项：
A.the credit spread only.
B.the benchmark yield only.
C.both the credit spread and the benchmark yield.
解释：
C is correct. Because the key point is that for an option-free fixed-rate bond, the same duration and convexity statistics that apply for a change in benchmark yield also apply for a change in spread.
考点：The Price Impact of Spread Changes
解析：对于固定利率不含权债券，久期和凸性这两个指标不仅适用于基准利率的变化，也适用于利差的变化。所以选项C正确。
那什么时候，只考虑benchmark呢，是国债吗，什么时候只考虑cread spread呢
