When deciding on the design of the primary backup repository, which option best fits the...

The best option for the primary backup repository design that fits the requirements in the case study is a Linux Repository using XFS integration, single-use credentials, and immutability. A Linux Repository is a type of backup repository that uses a Linux server as a backup target. A LinuxRepository can leverage XFS integration to enable fast creation and transformation of synthetic full backups by using XFS file system features such as reflink and copy-on-write. A Linux Repository can also use single-use credentials to enhance security by generating unique credentials for each backup job session. A Linux Repository can also provide immutability and ransomware protection for backup files by using Linux access control mechanisms such as immutable flag or chattr command.