X is a discrete random variable with possible outcomes X = {1

X is a discrete random variable with possible outcomes X = {1,2,3,4}. Three functions f(x), g(x), and h(x) are proposed to describe the probabilities of the outcomes in X.

The conditions for a probability function are satisfied by:

A.

f(x)

B.

g(x)

C.

h(x)

正确答案是B