Final answer:
The fastest backup restoration time is typically achieved through a combination of full backups and incremental backups.
Step-by-step explanation:
When considering backup strategies for optimal restoration times, you're looking for the method that allows you to restore data in the fastest, most efficient manner. Full backups make a complete copy of all selected data, whereas incremental backups and differential backups only copy the data that has changed since the last backup of its kind.
Full backups and incremental backups (Option C) are often considered the best combination for a quick restoration process. With this strategy, you would first restore from the full backup, which has all the data up to the point the backup was made, and then apply the incremental backups in the order they were taken, which would add all the data that has changed since the last full backup. This is generally faster than using differential backups, as differential backups require you to restore from the full backup and then apply the last differential backup, which may contain more data and thus take longer to apply than incremental changes.
In contrast, utilizing just incremental and differential backups without a recent full backup (Option D) could significantly slow down the restoration, as you would potentially need to apply multiple sets of incremental changes, in specific order, or manage larger differential backups. Therefore, the optimal choice for the fastest backup restoration time is a combination of full backups and incremental backups.