The command cat /proc/dma will show you what?

A.
Whether DMA is enabled

B.
Which DMA channels are in use

C.
Which DMA mode is in use

D.
General information about DMA on the machine

Explanation:

/proc/ dma This file contains a list of the registered ISA direct memory access (DMA) channels in
use. A sample /proc/ dma files looks like the following:
4: cascade
It shows whether DMA is enabled or not.