What is the descending order of the ranks of nobility under Delhi Sultanate

Q. What is the descending order of the ranks of nobility under Delhi Sultanate?

1. Khan 2. Malik

3. Amir 4. Sar-i-Khail

(a) 1, 2, 4, 3

(b) 2, 1, 4, 3

(c) 1, 2, 3, 4

(d) 3, 2, 4, 1

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