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【单选题】
设随机变量X的概率密度与分布函数分别为f(x)与F(x)，则下列选项正确的是( ).A.
0 ≤ f ( x ) ≤ 1
B.
P { X = x } ≤ F ( x )
C.
P { X = x } = F ( x )
D.
P { X = x } = f ( x )
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A.
while
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D.
when
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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