问题如下：
Factor betas in a well-diversified portfolio provide a means for constructing a hedging strategy to reduce systematic risk. True or False? Discuss.
选项：
A.True
False
解释：
True
Each factor can be used to hedge the same factor that is reflected in a given security.
请问为什么Well-diversified Portfolio 能降低系统性风险，降低的应该是非系统性风险吧？
