Which does not belong to the others.

The correct answer is Option (3) → Hard Drive

Note: The given answer is as per the official NTA Answer Key. However, the answer given by NTA appears to be incorrect: Windows is the only software among three pieces of computer hardware, so Option (2) is the correct answer, as explained below. Windows is the only one of the four you cannot touch, yet NTA’s key picked the hard drive.

Hardware is the physical part of a computer that can be seen and touched; software is the set of programs that runs on it.