An administrator has created a mapping with the following command: cryptsetup luksOpen /dev/sda1 cryptvol and has set three different keys. Which command below will delete the first key?

The `cryptsetup luksDelKey` command deletes a key from a LUKS volume, requires the underlying device (`/dev/sda1`) where the LUKS header resides, and uses a zero-indexed slot number (0 for the first key).

While the device is correct, using index `1` would delete the second key slot, not the first.

The `/dev/mapper/cryptvol` refers to the decrypted mapped device, not the underlying LUKS-encrypted device where key slots are managed.

The `/dev/mapper/cryptvol` refers to the decrypted mapped device, not the underlying LUKS-encrypted device where key slots are managed.