You are managing a small Cloud SQL instance for developers to do testing. The instance is not critical and has a recovery point objective (RPO) of several days. You want to minimize ongoing costs for this instance. What should you do?

A. Take no backups, and turn off transaction log retention. B. Take one manual backup per day, and turn off transaction log retention. C. Turn on automated backup, and turn off transaction log retention. D. Turn on automated backup, and turn on transaction log retention.