Which one of the following is the most important part of a Computer system?

Which one of the following is the most important part of a Computer system? Correct Answer Hardware

Computer hardware includes the physical parts of a computer, such as the case,central processing unit (CPU), monitor, mouse, keyboard, computer data storage, graphics card, sound card, speakers and motherboard. By contrast, software is the set of instructions that can be stored and run by hardware. Hardware is so - termed because it is "hard" or rigid with respect to changes, whereas software is "soft" because it is easy to change.
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___ controls the way in way in which the computer system functions and provides a means by which users can interection with the computer .