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【单选题】
有效边界的特征是(    )。
A.
有效边界上的点都具有最大的收益
B.
有效边界上的点都具有最小的风险
C.
有效边界上的点具有最小风险的同时具有最大的收益
D.
有效边界上的点具有在给定收益下最小的风险，给定风险下最小的收益
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