A group of DevOps engineers adopted the network as code methodology to manage network infrastructure. During a code release, the engineers find a bug that is causing issues on production. Which safeguard will allow the engineers to restore functionality to the production site?

Code review is a process where peers examine the code before it is merged or deployed. While it helps catch bugs before they reach production, it does not provide a mechanism to restore functionality after a bug has already been deployed, making it ineffective in this scenario.

Code testing involves running various tests on the code to identify bugs before deployment. Although essential for ensuring code quality, testing does not address the situation once the code has already caused problems in production. It cannot reverse the effects of a bug that is already impacting functionality.

Staging refers to a pre-production environment where code can be deployed for further testing before going live. While it helps catch issues early, it does not provide a solution for reverting changes made to the production environment after a bug has been identified.