Operating System (OS)
A program

is a device that performs a sequence of operations specified by instructions in memory.
is typically characterized by interactive processing and time of the CPU
None of these
is a sequence of instructions
is the device where information is stored

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Operating System (OS)
System maintenance:

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

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