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

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

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Operating System (OS)
The disadvantages of "Compile and Go" loading scheme is (are):

it is very difficult to handle multiple segments, especially if the source programs are in different languages, and to produce orderly modular programs.
it is necessary to retranslate the user's program deck every time it is run.
None of these
a portion of memory is wasted because the core occupied by the assembler is unavailable to the object program.
All of these

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

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
None of these
All of these
to provide security against loss of information due to system failure

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