Which of the Following Is Not a Required Condition for the Distribution

Multiple Choice

Which of the following is not a required condition for the distribution of a discrete random variable X that can assume values x_i?

A) 0 $\le$ p(x_i) $\le$ 1 for all x_i
B) $$\sum _ { \text {all } x _ { 1 } } p \left( x _ { i } \right) = 1$$
C) p(x_i) > 1 for all x_i
D) All of these choices are true.