Which of the following would allow for the QUICKEST restoration of a server into a warm recovery site in a case in which server data mirroring is not enabled?

A full backup alone does not capture changes made after the last full backup was taken, meaning data loss would be greater and it would not reflect the most recent state of the server.

Incremental backups require restoring the last full backup plus every incremental backup taken since then in sequence, making the restoration process the most time-consuming of the backup strategies listed.

A differential backup captures all changes made since the last full backup, meaning restoration requires only two steps: restoring the most recent full backup and then applying the single latest differential backup. This is faster than incremental restores (which require chaining multiple tapes/sets) while still being more current than a full backup alone, making it optimal for warm site recovery speed.

While snapshots can enable rapid recovery, they are typically point-in-time copies stored on the same or attached storage system and are not traditionally used for warm site disaster recovery scenarios where the primary infrastructure is unavailable.