Which backup and restore solution should Jill use?

Jill is about to test some rule and object changes suggested in an NGX newsgroup. Which backup and restore solution should Jill use, to ensure she can most easily restore her Security Policy to its previous configuration, after testing the changes?

A.
SecurePlatform backup utilities

B.
Manual copies of the $FWDIR/conf directory

C.
upgrade_export and upgrade_import commands

D.
Policy Package management

E.
Database Revision Control