What command must be run to enable DMA on it?

One of the IDE hard drives in a server is transferring data very slowly. What command must
be run to enable DMA on it?

A.
hdparm -d /dev/hda

B.
hdparm –dma /dev/hda

C.
hdparm –dma /dev/hda1

D.
hdparm -d /dev/hda1

E.
hdparm -d1 /dev/hda