Rotovator is

Answer: Option D

A rotovator is an agricultural implement that can serve both as a primary tillage implement and a secondary tillage implement, depending on its use and settings.

As a primary tillage implement, a rotovator is used to perform deep soil tillage to break up hard and compacted soil, prepare the field for planting, and bury crop residues. It is capable of working at a greater depth and is often used to prepare the soil for the initial seedbed preparation.

As a secondary tillage implement, a rotovator is used for shallow tillage after the primary tillage is done. It is used to create a finer seedbed, control weeds, and incorporate fertilizers or amendments into the soil. In this role, it helps in refining the soil structure and preparing it for planting.

Since a rotovator can perform both primary and secondary tillage operations, the correct answer is "D. Both A and B."