What is the correct chronological sequence of the following saints?

Q. What is the correct chronological sequence of the following saints?

1. Shankaracharya 2. Ramanuja

3. Shankaradeva 4. Dadu

Codes:

(a) 1, 2, 3, 4

(b) 4, 3, 2, 1

(c) 3, 1, 4, 2

(d) 2, 1, 3, 4

Ans: (d) 2, 1, 3, 4