With reference to Unmanned Aerial Vehicles (UAVs), consider the following statements : 1. All types of UAVs can do vertical landing. 2. All types of UAVs can do automated hovering. 3. All types of UAVs can use battery only as a source of power supply. How many of the statements given above are correct?

Option (d) is correct because all three statements use the absolute qualifier "all," which is factually incorrect: fixed-wing UAVs generally require runways and cannot hover, and many models utilize internal combustion engines or solar power rather than just batteries. Option (a) is the most tempting wrong choice for candidates who mistakenly equate all UAVs with multi-rotor drones (quadcopters) that do possess these specific capabilities. The core concept tested is the technical diversity of UAV configurations, specifically the fundamental differences in flight mechanics and propulsion between fixed-wing and rotary-wing systems.