Which of the following are valid probability distributions for a discrete random variable? check all that apply.

a. 0.16, 0.193, 0.222, 0.233, 0.067, 0.125
b. 0.35, 0.18, 0.21, 0.06, 0.17, 0.03
c. (0.01) 11, (0.01) 12, (0.01) 13
d. 0.16, 0.12, 0.02, 0.08, 0.22, 0.05, 0.15, 0.02, 0.18
e. 0.12, -0.02, 0.18, 0.08, 0.15, 0.05, 0.16, 0.27, 0.02, 0.36, -0.15, -0.22