Discussion
The fastest I/O data transfer uses :
Answer: D
The fastest I/O data transfer uses DMA.
In direct memory access, a DMA controller takes over the system bus and moves data directly between the I/O device and memory, without the processor fetching and executing an instruction for each byte. Transfers run at bus speed, which is why disks and other high-speed devices use DMA for block transfers.
Polled I/O wastes processor time testing device status, and interrupt-driven I/O still needs the processor to run a service routine for every transfer. Memory-mapped I/O is a way of addressing I/O ports, not a transfer method, and its transfers still pass through the processor.
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