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?

UAVs come in multiple types — fixed-wing, rotary-wing (multirotor), hybrid, and flapping-wing. Fixed-wing UAVs cannot perform vertical landing or hover; they require a runway or landing strip. Hence statement I is incorrect. Only rotary-wing and some hybrid UAVs can automatically hover, so statement II is also incorrect. UAVs can be powered by various energy sources including batteries, fuel (petrol/diesel), solar power, or hydrogen fuel cells; not all UAVs rely solely on batteries, so statement III is incorrect. None of the statements is correct.