Explanation:

The term 'hardware' refers to all the physical, tangible components of a computer system that can be seen and touched. This includes the central processing unit (CPU), memory, storage devices, input/output devices, and the casing itself. 'Software,' in contrast, refers to the intangible set of instructions, programs, and data that tell the hardware what to do. A 'keyboard' and 'memory' are specific examples of hardware components, but they do not encompass the entire physical structure of a computer. Thus, 'hardware' is the correct general term.