Explanation:

- Gulzarilal Nanda: He served as the acting Prime Minister of India following Jawaharlal Nehru’s death in 1964. He was the Union Minister for Home Affairs at that time and stepped in as interim leader until a successor was chosen.

- Morarji Desai: He took over as Prime Minister much later, in 1977, after Indira Gandhi's emergency period.

- Indira Gandhi: Became Prime Minister in January 1966, after the death of Lal Bahadur Shastri, Nehru’s successor.

- Zakir Hussain: He was the President of India, not the Prime Minister. He became the President in 1967.