How should the RAID 1 set be repaired?

To provide fault tolerance for a database server, a software RAID 1 is created. A few months later, one of the RAID 1 hard disks fails. How should the RAID 1 set be repaired?

A.
remove/break the mirror set, replace the failed disk, and recreate the mirror

B.
add another disk to the mirror set, convert the mirror set to RAID 5, recreate the information from parity, and convert it back to RAID 1

C.
add another disk to the mirror set, synchronize it with the healthy disk, and remove the failed disk from the mirror set

D.
replace the failed disk, remove/break the mirror, and let the mirror regenerate automatically