The Simla pact, also known as the Simla Agreement, was an important agreement signed between India and Pakistan. It was signed on July 2, 1972, in Simla, India.

Let`s analyze each option to understand who signed the Simla pact:

Option 1: Indira Gandhi and Zia-ul-Haq

This option is incorrect. Zia-ul-Haq became the President of Pakistan in 1978, which is six years after the signing of the Simla pact.

Option 2: Lai Bahadur Shastri and Ayub Khan

This option is also incorrect. Ayub Khan was the President of Pakistan in the 1960s, but the Simla pact was signed in 1972, after his resignation.

Option 3: Indira Gandhi and Zulficar Ali Bhutto

This is the correct answer. Indira Gandhi, the Prime Minister of India at that time, and Zulficar Ali Bhutto, the President of Pakistan, signed the Simla pact.

Option 4: Rajiv Gandhi and Benazir Bhutto

This option is incorrect. Rajiv Gandhi became the Prime Minister of India in 1984, twelve years after the Simla pact was signed. Ben