A disk drive failed in a RAID 5 array. After replacing the disk drive, users are still reporting that access to the server is very slow. Which of the following BEST explains the problem?

When a failed disk in a RAID 5 array is replaced, the RAID controller must rebuild the lost data onto the new disk using the parity information distributed across the remaining drives. This rebuilding process is very I/O intensive, consuming significant disk and CPU resources, which leads to a noticeable degradation in performance and slow access for users.

While some RAID configurations might require manual intervention, most modern RAID controllers automatically begin the rebuild process once a new, compatible drive is inserted into a degraded array, so reconfiguration is not typically the immediate cause of slow access.

If the array were corrupt, it would likely be inaccessible or experience data loss errors rather than just being slow, assuming the rebuild is progressing without critical issues.

If the disk drive was incompatible, the RAID controller would typically not initiate a rebuild or would report an error, making the array inaccessible or remaining in a degraded state rather than simply performing slowly.