After performing a significant software update on a Windows operating system, you want to ensure that the system can be reverted back to its previous state if any issues arise. What is the BEST step to take immediately before the update to allow for system recovery?
Enable System Restore, if it's not already enabled, and create a new restore point.
Delete all system temporary files to clean up any remnants from the update.
Defragment the hard disk to ensure optimal performance following the update.
Run a full system antivirus scan to ensure the integrity of the update.