How should you rebuild this RAID array?

You’ve received a message in your error log that a drive in your RAID 1 array is faulty. What’s the best way to rebuild this RAID 1 array?

A) RAID 1 arrays are redundant, so you simply need to replace the bad drive

B) RAID 1 arrays are not redundant, so you’ll need to replace the drive and restore from a backup

C) RAID 1 arrays are redundant, but will still require restoration from backup after the drive is replaced

D) RAID 1 arrays cannot be rebuilt

E) RAID 1 arrays are like cats, and will only be rebuilt when they really want to