Match the following.

List-I (Theoretical Distribution)	List-II (Formula)
a. Mean of binomial distribution	1. np
b. Mean of poisson distribution	2. m
c. Standard deviation of binomial distribution	3. $$\sqrt {{\text{npq}}} $$
d. Standard deviation of poisson distribution	4. $$\sqrt {\text{m}} $$

A. a-1, b-2, c-3, d-4

B. a-4, b-3, c-2, d-1

C. a-1, b-3, c-2, d-4

D. a-4, b-1, c-2, d-3

Answer: Option A