When, for the first time, did the Election Commission of India become a multi-member body?

1989

The correct answer is Option 3 - 1989

The Election Commission of India became a multi-member body for the first time on October 16, 1989, with the appointment of two Election Commissioners alongside the Chief Election Commissioner.

However, their tenure was very short, lasting only from October 16, 1989, to January 1, 1990. The concept of a multi-member Election Commission with a permanent additional two Election Commissioners became operational only in 1993.