Operating System (OS)
Data encryption

is mostly used by financial networks
is not necessary, since data cannot be intercepted
None of these
cannot be used by private installations
is mostly used by public networks

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Operating System (OS)
The Register - to - Register (RR) instructions

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, except in the case of store operation when it is also
None of these
All of these
which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.
have both their operands in the main store.

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