Functions of an operating system, Computer Engineering

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a) In multitasking Operating Systems, there are two types of multitasking such as the "Preemptive Multitasking" and the "Cooperative Multitasking". Describe the two mentioned multitasking type and give a reason which of the two is better.

b) Explain the four main functions of an operating system.

c) What is a modem and give two different kinds of modems.

d) There are several different types of threats concerning computer security. Explain two of such threats.


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