[单选题]

Which of the following most accurately describes how to standardize a random variable X?

A.Subtract the mean of X from X,and then divide that result by the standard deviation of X.

B.Subtract the mean of X from X,and then divide that result by the standard deviation of the standard normal distribution.

C.Divide X by the difference between the standard deviation of X and the standard deviation of the standard normal distribution.

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