Operating System (OS)
Addressing modes

None 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.
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
All of these

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Operating System (OS)
A public key encryption system

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

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