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Answer:
A computer is defined as an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program.
Four features of a computer would be CPU, GPU, Memory, and Motherboard.
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Answer:
Mainframe Computer is capable of doing all the functions which are listed in question.
Explanation:
A mainframe is a very large general-purpose computer (usually costing millions of dollars) that is capable of performing very many simultaneous functions, supporting very many simultaneous users, and storing huge amounts of data. A microcomputer is the type of computer you use.
To direct the employees and respond to any calls/emails regarding a problem or upgrade that should be changed/fixed. (I don't know if that's what you wanted)