Which two statements are true about the effects of executing the mkfs command?

After creating empty mount point /xfs1, you execute the command:
# mkfs -t xfs -L /xfs1 -I logdev=/dev/sdd1 /dev/sdh1

Which two statements are true about the effects of executing the mkfs command?

A.
it fails if there is an existing XFS file system on/dev/sdh1.

B.
it fails if there is an existing XFS log on/dev/sdd1.

C.
it fails if there is an existing XFS file system on/dev/sdd1.

D.
it fails because there is no size specified for the XFS log.

E.
Thexfslfile system is mounted automatically during system startup.

F.
It creates and mounts the/xfs1file system.