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

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

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

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
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.
is a hardware memory device which denotes the location of the current instruction being executed.

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