Which option is used to restore the most recent backup version of a file, even...

According to the IBM Spectrum Protect V8.1.9 documentation, the option to restore the most recent backup version of a file, even if the backup is inactive, is the LATEST option. This option will restore the last backup version of a file regardless of the backup's status.

Here is an example command using the LATEST option to restore a file:

restore /home/user1/testfile -latest

This command will restore the most recent backup version of the file "testfile" regardless of whether the backup is active or inactive.

https://www.ibm.com/docs/en/spectrum-protect/8.1.12?topic=clients-restoring-your-data