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【多选题】
关于投资组合,下列说法正确的是( )A.
相关系数为 — 1 时，所有的风险都能被分散掉。
B.
当相关系数 为 1 时，风险无法被分散。
C.
当 由两种证券组成投资组合时，只要 相关系数 小于 1 ，组合的分散化效应就会发生作用。
D.
若投资组合中包含的证券数量超过 两只时，通常情况下，投资组合的风险将随所包含的股票数量的增加而降低。
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