Operating System (OS)
The LRU algorithm

pages out the first page in a given area
None of these
pages out pages that have not been used recently
pages out pages that have been least used recently
pages out pages that have been used recently

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Operating System (OS)
The Memory Buffer Register (MBR)

is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
None of these
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".
contains the address of the memory location that is to be read from or stored into.
is a hardware memory device which denotes the location of the current instruction being executed.

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Operating System (OS)
The function(s) of file system is (are):

to provide complete file naming freedom to the users and to permit controlled sharing of files
to provide security against loss of information due to system failure
All of these
None of these
to provide for long and short term storage of files with appropriate economic tradeoffs.

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