Group A should fit the air defense system of the Air Force. 

If it is the level of group C commercial drones, a soft kill would be sufficient.

However, a soft kill is not enough for an attacking fixed-wing UAV belonging to Group B, which is currently emerging as the most serious threat. Since it mainly flies at an altitude of 500 meters or less avoiding the anti-aircraft radar defenses, a low-altitude detection radar is essential, and a soft kill for GNSS (L1, L2) is essential in order to prevent an attack at an accurate point. However, it would be nice if it could be neutralized with a perfect soft kill, but a hard kill is absolutely necessary as a last resort.

The drone defense system has to be designed according to various environments and situations, so I would appreciate it if you could contact us.