Operating System (OS)
Which of the following capabilities is required for a system program to execute more than one program at a time?

word processing
None of these
multitasking
virtual memory
compiling

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

None of these
All of these
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
have both their operands in the main store.
which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.

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Operating System (OS)
Link encryption

is more secure than end-to-end encryption
can not be used in a public network
is less secure than end-to-end encryption
is used only to debug
None of these

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