What Is a Characteristic of the Mass Function of a Discrete

Multiple Choice

What is a characteristic of the mass function of a discrete random variable X?

A) The sum of probabilities P(X = x) over all possible values x is 1.
B) For every possible value x, the probability P(X = x) is between 0 and 1.
C) Describes all possible values x with the associated probabilities P(X = x) .
D) All of the above.