monte carlo模拟不是也需要指定一个分布吗？c为什么是正确的

问题如下：

Hextall explains that HB, a US bank holding company, has implemented a value at risk (VaR) approach and notes that there are three distinct methods to estimate VaR. The parametric method assumes that the distribution of returns on the risk factors is normal, and it is considered to be a straightforward approach. The historical simulation method also relies on the normal distribution assumption. The Monte Carlo simulation method relies on neither a normal distribution nor past returns and, as a result, is able to accommodate bonds that may contain embedded options.

Which of Hextall’s explanations regarding the three distinct methods of VaR is least likely correct?

选项：

A.

Historical

B.

Parametric

C.

Monte Carlo

解释：

Hextall incorrectly explains the historical method by stating that it relies on the assumption that the distribution of returns on the risk factors is a normal distribution. The historical method is based on actual returns and, accordingly, is not constrained by the assumption of a normal distribution.