You host an application in Google Cloud. The application is located in a single region and uses Cloud SQL for transactional data. Most of your users are located...

You host an application in Google Cloud. The application is located in a single region and uses Cloud SQL for transactional data. Most of your users are located in the same time zone and expect the application to be available 7 days a week, from 6 AM to 10 PM. You want to ensure regular maintenance updates to your Cloud SQL instance without creating downtime for your users. What should you do?

A. Configure a maintenance window during a period when no users will be on the system. Control the order of update by setting non-production instances to earlier and production instances to later. B. Create your database with one primary node and one read replica in the region. C. Enable maintenance notifications for users, and reschedule maintenance activities to a specific time after notifications have been sent. D. Configure your Cloud SQL instance with high availability enabled.