Your company operates its application workloads on Google Cloud's Compute Engine. These applications are deployed across three environments: production, acceptance, and development. The production environment is business-critical and runs 24/7, whereas the acceptance and development environments are essential only during office hours (9 AM to 5 PM). Given that the acceptance and development environments are idle outside of office hours, your CFO has asked you to identify ways to optimize costs during non-critical times. How should you proceed to achieve these cost savings?