During direct memory access (DMA), the INTR and INTA (interrupt and interrupt acknowledge) lines:

A. are never used

B. are used by the DMA controller to acquire the data and address bus from the microprocessor

C. are used by the I/O device to invoke an error routine if a problem occurs during DMA transfer

D. are used by the DMA controller to signal the microprocessor about the end of the current data transfer

Answer: Option A