Which of the following provides a point-in-time, copy-on-write copy of storage data?

A RAID hot spare is a disk that automatically replaces a failed disk in a RAID array, ensuring data redundancy, not providing a point-in-time copy.

LUN migration is the process of moving a Logical Unit Number (LUN) from one storage location to another, which involves moving active data, not creating a point-in-time copy.

A clone is a full, independent copy of a volume or virtual machine at a specific point in time, which typically duplicates all data immediately rather than using copy-on-write for efficiency like a snapshot.

A snapshot is a point-in-time image of a volume or disk, often implemented using copy-on-write technology. When data changes on the original volume, the original data block is copied to a separate area before the new data is written, preserving the state from when the snapshot was taken without duplicating the entire dataset.