How can DMA be enabled for the device /dev/hda?

How can DMA be enabled for the device /dev/hda?

A.
echo “1” >/proc/ide/hda/dma

B.
sysctl -w dev.ide.dma=l

C.
dma add /dev/hda

D.
hdparm -d 1 /dev/hda

E.
insmod dma dev=/dev/had