Who was the Deputy Prime Minister of India (1977-79)?

The correct answer is Option 4 - Both options 1 and 2

Both Charan Singh and Jagjivan Ram were accorded the title of deputy prime minister in the Janata Government.

Jagjivan Ram (1908–1986): Freedom fighter and Congress leader from Bihar; Deputy Prime Minister of India (1977-79); member of Constituent Assembly; also a Member of Parliament since 1952 till his death; Labour Minister in the first ministry of free India; held various other ministries from 1952 to 1977; a scholar and astute administrator.

Chaudhary Charan Singh (1902-1987): Prime Minister of India between July1979 - January 1980; freedom fighter; active in the politics of Uttar Pradesh; proponent of rural and agricultural development; left Congress party and founded Bharatiya Kranti Dal in 1967; twice Chief Minister of U.P.; later he was one of the founders of the Janata Party in 1977 and became Deputy Prime Minister and Home Minister (1977-79); founder of Lok Dal.