Operating System (OS)
An incremental backup

should be done each month
None of these
saves all files
uses more tapes
saves only files that have recently changed

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Operating System (OS)
A public key encryption system

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

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Operating System (OS)
The Storage-to-Storage instructions

which perform indicated operations on two fast registers of the machine and have the result in one of the registers
which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, expect in the case of store operation when it is also
None of these
All of these
have both their operands in the main store.

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