According to Ain-i-Akbari, the land which was annually cultivated for each crop in succession and was never allowed to lie fallow was called:

Polaj

The correct answer is Option (4) → Polaj

Different types of land mentioned in Ain- 

Polaj, land which is annually cultivated for each crop in succession and is never allowed to lie fallow.

Parauti, land left out of cultivation for a time that it may recover its strength.

Chachar, land that has lain fallow for three or four years.

Banjar, land that is left uncultivated for five years and more.