A LUKS device was mapped using the command:
cryptsetup luksOpen/dev/sdal crypt-vol
Given that this device has three different keys, which of the following commands deletes only the first key?

A.
cryptsetup luksDelKey /dev/sda 1 0

B.
cryptsetup luksDelkey /dev/sda 1 1

C.
cryptsetup luksDelKey / dev /mapper/crypt- vol 1

D.
cryptsetup luksDelKey / dev /mapper/crypt- vol 0

Explanation:
https://help.ubuntu.com/community/EncryptedFilesystemHowto3