Operating System (OS)
Process is

contents of main memory
a job in secondary memory
program in High level language kept on disk
None of these
a program in execution

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

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".
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.

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Operating System (OS)
Addressing structure

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

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