An engineer is configuring the RAID on a new server that will support a large database handling real-time data processing. The system needs to have the largest available space with the best write…

This choice is textually identical to C. In a real exam, this would be a problematic question, but assuming C is the intended correct answer, A would also be technically correct in its description of the OS configuration.

Configuring the OS on one SSD in RAID 0 (or a single disk) fails to provide a "redundant OS disk" as required by the problem statement.

Configuring the OS on two 300GB SSDs in a RAID 1 array ensures a redundant boot drive. This leaves two additional 300GB SSDs and eight 1.2TB 15K SAS disks available for the database. The eight 1.2TB 15K SAS disks can then be configured into a RAID 10 array, offering a balance of 4.8TB usable space and providing excellent write performance for a large database handling real-time data processing.

Configuring the OS on two SSDs in RAID 0 provides no redundancy, failing the "redundant OS disk" requirement, and RAID 0 is inherently risky for an OS drive.