Which single statement is true for creating a labeled filesystem in RAID-1 on devices /dev/sdc and /dev/sdd?

Which single statement is true for creating a labeled filesystem in RAID-1 on devices /dev/sdc and /dev/sdd?

A.
mkfs -t btrfs -d raidl /dev/sdc /dev/sdd

B.
mkfs.btrfs -d raidl -L Btrfs /dev/sdc /dev/sdd

C.
mkfs.btrfs -r raidl -L Btrfs /dev/sdc /dev/sdd

D.
mkfs.btrfs -L Btrfs /dev/sdc /dev/sdd

Explanation:
Reference:https://www.howtoforge.com/a-beginners-guide-to-btrfs