The police rounded up Salman, Aamir, Saif and Shahrukh because one of them was suspected of having robbed the local bank. The four suspects made the following statements under intensive questioning.
Salman: Aamir did it.
Aamir : Shahrukh did it.
Saif: I did not do it.
Shahrukh: Aamir lied when he said that I did it.
If only one of the above statements is true, who did it?
(a) Salman
(b) Aamir
(c) Saif
(d) Shahrukh.