On 2nd July 1972, with which Pakistani leader did Indira Gandhi sign Shimla Agreement ?

On 2nd July 1972, with which Pakistani leader did Indira Gandhi sign Shimla Agreement ?
(A) Ayub Khan
(B) Yahya Khan
(C) Zulfikar Ali Bhutto
(D) Muhammad Zia-ul-Haq
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ANS- (C) Zulfikar Ali Bhutto