Operating System (OS)
Operating system

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

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

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

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