Assertion (A): In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group. Reason (R): In a group, the atomic radius generally increases from top to bottom.

1. (a)Both A and R are individually true and R is the correct explanation of A
2. (b)Both A and R are individually true but R is NOT the correct explanation of A
3. (c)A is true but R is false
4. (d)A is false but R is true