Operating System (OS)
Memory

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

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Operating System (OS)
The term "operating system" means

the way a computer operator works
a set of programs which controls computer working
the way a floppy disk drive operates
None of these
conversion of high level language into machine code

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