With reference to Unmanned Aerial Vehicles (UAVs), consider the following statements: I. All types of UAVs can do vertical landing. II. All types of UAVs can do automated hovering. III. All types of UAVs can use battery only as a source of power supply. How many of the statements given above are correct?

I. All types of UAVs can do vertical landing — Incorrect. Fixed-wing UAVs generally need a runway/recovery system; only VTOL types can land vertically.

II. All types of UAVs can do automated hovering — Incorrect. Hovering is a feature of rotary-wing or some VTOL UAVs; fixed-wing UAVs cannot hover in place.

III. All types of UAVs can use battery only as a source of power supply — Incorrect. UAVs may use batteries, fuel engines, hybrid systems, solar power, etc.; battery-only is not universal.

Hence, none of the statements is correct.