Operating System (OS)
Addressing modes

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

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Operating System (OS)
A public key encryption system

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

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