Final answer:
The best RAID configuration for high read speeds and fault tolerance with a low likelihood of multiple drive failures is RAID 10, which provides the benefits of both RAID 0 and RAID 1.
Step-by-step explanation:
A security administrator seeking a RAID configuration that prioritizes high read speeds and fault tolerance, with a low likelihood of multiple drive failures simultaneously, should choose RAID 10. RAID 10 combines the benefits of RAID 0 (striping, which provides higher read speeds) and RAID 1 (mirroring, which provides fault tolerance). This configuration is especially preferred in environments where data security and performance are critical. While RAID 5 does offer fault tolerance and good read performance, its write performance is slower due to parity calculations, and if a drive fails, the rebuild time could put the array at risk if another drive were to fail during that process. Therefore, RAID 10 is a superior choice for scenarios where high read speeds and fault tolerance are the primary concerns, and the unlikelihood of multiple simultaneous drive failures can be reasonably assumed.