Operating System (OS)
System maintenance:

is usually not necessary
always requires several programs
is not required if the system is well written
None of these
is necessary on all systems, regardless of how good

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Operating System (OS)
A real time operating system is most likely to be used for which of the following task?

Controlling access to a shared printer in a network
Managing the access to system files in a laptop computers
Controlling the fuel injection system of an automobile engines
Ensuring that system clock works correctly on server

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