Let \( X \) be a discrete random variable. Then the variance of \( X \) is (A) \( E\left(X^{2}\r...

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Let \( X \) be a discrete random variable. Then the variance of \( X \) is
(A) \( E\left(X^{2}\right) \)
(B) \( E\left(X^{2}\right)+(E(X))^{2} \)
(C) \( E\left(X^{2}\right)-(E(X))^{2} \)
(D) \( \sqrt{E\left(X^{2}\right)-(E(X))^{2}} \)
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