A mirrored rootvg internal disk, hdisk1, has failed and must be replaced. The remaining mirrored disk, hdisk0, is intact and functioning normally. What is the correct sequence of actions?

Running unmirrorvg rootvg hdisk1 cleanly removes the logical volume mirror copies from the failed disk and updates the volume group descriptor, ensuring rootvg remains consistent on the surviving hdisk0. This must precede physical removal so AIX does not attempt to sync data to a disk that no longer functions.

rmdev -l hdisk1 -d removes the device definition from the ODM but must follow unmirrorvg, not precede it - removing the device first leaves the volume group in an inconsistent mirrored state.

While the command text appears identical to A, this choice does not represent the accepted correct starting action in the prescribed replacement sequence.

unmirroivg is a misspelled, non-existent AIX command and would fail immediately with a command-not-found error.