问题如下：
The risk measure referred to in Statement 3 is:
选项：
A.active share.
beta sensitivity
ex post tracking error.
解释：
C is correct. A traditional asset manager uses ex post tracking error when analyzing backward-looking returns. The Diversified Fixed-Income Fund prospectus stipulates a target benchmark deviation of no more than 5 bps. Tracking error is a measure of the degree to which the performance of a given investment deviates from its benchmark.
老师好， 这题有提到deviation between portfolio returns and benchmark returns. 为什么不是active share? C 怎么理解?thank you.
