The Relationship Between the Standard Normal Random Variable, Z, and Normal

Multiple Choice

The relationship between the standard normal random variable, z, and normal random variable, X, is that

A) only the normal random variable X is continuous.
B) only the standard normal variable z is continuous.
C) the standard normal variable z counts the number of standard deviations that the value of the normal random variable X is away from its mean.
D) the values of the standard normal random variable z cannot be negative.
E) the values of the normal random variable X cannot be negative.