Operating System (OS)
Memory management is :

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

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Operating System (OS)
The CPU, after receiving an interrupt from an I/O device

None of these
halts for a predetermined time
branches off to the interrupt service routine immediately
branches off to the interrupt service routine after completion of the current instruction
hands over control of address bus and data bus to the interrupting device

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