Operating System (OS)
The most common security failure is

insufficient technology used to prevent breaches
carelessness by users
too much emphasis on preventing physical access
depending on passwords
None of these

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Operating System (OS)
Memory management is :

replaced with virtual memory on current systems
not used in modern operating system
critical for even the simplest operating systems
not used on multiprogramming systems
None of these

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Operating System (OS)
The Storage-to-Storage 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, expect in the case of store operation when it is also
All of these
which perform indicated operations on two fast registers of the machine and have the result in one of the registers
have both their operands in the main store.
None of these

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