An administrator setting up software RAID 1 on a Windows Server with two volumes for two separate hard drives， but the option for mirrored is grayed out.  Which of the following is the MOST likely reason why this is occurring？（）

• A、 The disks have been setup as basic.
• B、 The page file must be at least 4GB to support mirrored drives.
• C、 The disks have been setup as dynamic.
• D、 Windows does not support software RAID 1.