Operating System (OS)
A public key encryption system

None of these
allows anyone to decode the transmission
allows only the correct sender to decode the data
allows only the correct receiver to decode the data
does not encode the data before transmitting it

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

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

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