Operating System (OS)
All the time a computer is switched on, its operating system software has to stay in

floppy disk
primary storage
None of these
main storage
disk drive

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Operating System (OS)
Memory

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

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