Collective farming is also known by which name?

Kolkhoz

The correct answer is Option 2: Kolkhoz

Collective farming refers to a system in which farmers work together on jointly owned agricultural land. In the former Soviet Union, such collective farms were called Kolkhoz.

NCERT: Collective farming or the model of Kolkhoz was introduced in erstwhile Soviet Union to improve upon the inefficiency of the previous methods of agriculture and to boost agricultural production for self-sufficiency