TEV是什么？IR怎么求的？

问题如下：

Over the past year, the HIR Fund had a return of 7.8%, while its benchmark, the S&P 500 index, had a return of 7.2%. Over this period, the fund's volatility was 11.3%, while the S&P index's volatility was 10.7% and the fund's TEV was 1.25%. Assume a risk-free rate of 3%. What is the information ratio for the HIR Fund and for how many years must this performance persist to be statistically significant at a 95% confidence level?

选项：

A.0.480 and approximately 16.7 years B.0.425 and approximately 21.3 years C.3.840 and approximately 0.2 years D.1.200 and approximately 1.9 years

解释：