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?
1
Only one
2
Only two
3
All the three
4
None