Match the following columns

Column I	Column II
a. Student's distribution was discovered by	1. N is > 30
b. Large sample theory is applicable when	2. Gosset
c. The $${\chi ^2}$$-test was devised by	3. Always positive
d. The calculated value of $${\chi ^2}$$ is	4. Karl Pearson

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

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

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

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

Answer: Option D