Which of the following techniques can be used to automatically rebuild a RAID array due to a disk failure?

A hot spare is a disk drive that is part of a RAID system but is not actively used for data storage until another drive in the array fails. Upon detecting a disk failure, the RAID controller automatically activates the hot spare, transfers the redundancy information (like parity) to rebuild the array, and restores data protection.

Striping (RAID 0) distributes data across multiple disks without any redundancy, meaning a single disk failure leads to complete data loss and no rebuild is possible.

A cold spare is a replacement drive kept offline, requiring manual installation and configuration to replace a failed drive, thus not enabling an automatic rebuild.

Parity is a data redundancy technique used in RAID levels like RAID 5 or RAID 6 to allow data reconstruction after a disk failure, but it is the method for redundancy, not the component that automatically initiates the rebuild process.