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

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
None of these

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Operating System (OS)
Operating system

links a program with the subroutines it references
enables the programmer to draw a flowchart
All of these
None of these
provides a layered, user-friendly interface

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