Operating System (OS)
In which of the storage placement strategies a program is placed in the smallest available hole in the main memory?

None of these
first fit
best fit
worst fit
buddy

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Operating System (OS)
The instruction register

is a hardware memory device which denotes the location of the current instruction being executed.
contains the address of the memory location that is to be read from or stored into.
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".
None of these

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