You have a large Cloud SQL for PostgreSQL instance. The database instance is not mission-critical, and you want to minimize operational costs. What should you do to lower the cost of backups in this environment?

A. Set the automated backups to occur every other day to lower the frequency of backups. B. Change the storage tier of the automated backups from solid-state drive (SSD) to hard disk drive (HDD). C. Select a different region to store your backups. D. Reduce the number of automated backups that are retained to two (2).