Can anyone explain to me how to find a discrete random variable from a probability distribution table.

The question asks me to:

Two cards are drawn from a standard deck of 52 cards (with replacement).

(a) Make a probability distribution table for the number of hearts drawn.

(b) What is the discrete random variable in part (a)?

For part 1(a) I got P(x=0)=0.56, P(x=1)=0.38, and P(x=2)=0.06.

Can anyone please help me solve part b?