Operating System (OS)
Supervisor state is

never used
required to perform any I/O
None of these
entered by programs when they enter the processor
only allowed to the operating system

ANSWER DOWNLOAD EXAMIANS APP

Operating System (OS)
The Memory Address Register

is a hardware memory device which denotes the location of the current instruction being executed.
contains the address of the memory location that is to be read from or stored into.
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 group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.

ANSWER DOWNLOAD EXAMIANS APP