Consider the following: I. Tughluqabad Fort. II. Lodi Garden. III. Qutub Minar. IV. Fatehpur Sikri. The correct chronological order in which they were built is:

1. (a)III, I, IV, II
2. (b)III, I, II, IV
3. (c)I, III, II, IV
4. (d)I, III, IV, II