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

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".
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
None of these
is a hardware memory device which denotes the location of the current instruction being executed.

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Operating System (OS)
The FIFO algorithm

None of these
executes first the job that first entered the queue
executes first the job that last entered the queue
executes first the job with the least processor needs
execute first the job that has been in the queue the longest

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Operating System (OS)
Addressing modes

None of these
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
All of these
defines the fundamental method of determining effective operand addresses
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.

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