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 after completion of the current instruction
hands over control of address bus and data bus to the interrupting device
branches off to the interrupt service routine immediately

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Operating System (OS)
The function(s) of file system is (are):

None of these
to provide security against loss of information due to system failure
to provide for long and short term storage of files with appropriate economic tradeoffs.
All of these
to provide complete file naming freedom to the users and to permit controlled sharing of files

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