Which three languages have been added to the Eighth Schedule of the Constitution by 71st Amendment?

Which one of the following languages was added to the Eighth Schedule by a Constitutional Amendment in 1967?

Which of these Amendment Act added language in 8th schedule of our Constitution?

Under which one of the following Constitutional Amendment Acts, four languages were added to the languages under the Eighth Schedule of the Constitution. Thereby raising their number to 22?

Which, amongst the following, is the latest language to be included in the Eighth Schedule of the Constitution of India?

Tenth schedule was added in constitution by which amendment act?