Briefing Android Knowledge

Which is the correct creation method of this?

The emulator supports mounting disk image files instead of an actual SD card. Which is the
correct creation method of this?

A.
mksdcard-l 2048 mysd.img

B.
mksdcard -create -I mysd 2048 mysd.img

C.
mksdcard -create -I mysd 2GB mysd.img

D.
mksdcard-l mysd 2048MB mysd.img

Explanation: