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?

Option (D) is correct because all three statements use the absolute qualifier "all," which is inaccurate given the diversity of UAV designs; for instance, fixed-wing UAVs cannot hover or land vertically, and many long-range models use internal combustion engines or solar power rather than just batteries. Option (A) is the most tempting wrong choice for candidates who might assume that battery power or vertical landing is a universal standard, but the distinct mechanical differences between fixed-wing and rotary-wing platforms invalidate such generalizations. The core concept tested is the technical classification, propulsion systems, and operational limitations of different Unmanned Aerial Vehicle (UAV) architectures.