Which of the following is called as Truck Farming?

The correct answer is Option 2: Farming in regions where farmers specialise in vegetables only

Truck farming refers to the commercial cultivation of vegetables for sale in urban markets. In this type of farming, farmers mainly specialise in growing vegetables and other market garden crops.

NCERT: "The regions where farmers specialise in vegetables only, the farming is know as truck farming. The distance of truck farms from the market is governed by the distance that a truck can cover overnight, hence the name truck farming."