After installing a new hard drive into a server for the purpose of mirroring the data from the first drive to the second one， the server displays an “operating system not found” error. Which of the following should the technician do to boot the server from the original drive？（）

• A、Replace the second drive with a hot swappable one.
• B、Swap the drive boot order in the BIOS
• C、Make the second disk active under the disk management tool.
• D、Rebuild the array using the hardware RAID tool at boot.