Question: What distinguishes interrupt - driven I / O from programmed I / O ? a . In programmed I / O , interrupts are not

What distinguishes interrupt-driven I/O from programmed I/O?
a.
In programmed I/O, interrupts are not used.
b.
In interrupt-driven I/O, the CPU is actively engaged in data transfer.
c.
Programmed I/O operates without the CPU.
d.
Interrupt-driven I/O does not use the system bus.

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