问题如下：
The Basel Committee requires backtesting of actual losses to VaR calculations. How many exceptions would need to occur in a 250-day trading period for the capital multiplier to increase from three to four?
选项：
A. two to five
B. five to seven
C. seven to nine
D. ten to more
解释：
D is correct. Ten or more backtesting violations require the institution to use a capital multiplier of four.
看了解析也没懂咋算的
