A company runs an application on Amazon RDS for PostgreSQL that receives traffic only on weekdays during business hours. The company wants to optimize costs and reduce operational overhead based on this usage pattern. Which solution meets these requirements?

The Instance Scheduler on AWS allows you to automatically start and stop Amazon RDS instances based on a predefined schedule. This directly addresses the requirement to optimize costs and reduce operational overhead for an application that only runs during business hours on weekdays. By stopping the instance when it's not in use, you avoid paying for idle compute time. Turning off automatic backups and creating manual snapshots increases operational overhead and introduces the risk of data loss or outdated backups if not performed diligently. Creating a custom Lambda function for starting and stopping based on CPU utilization is overly complex for a fixed schedule and adds unnecessary development and maintenance overhead. Purchasing All Upfront Reserved DB Instances provides a discount for continuous usage but doesn't reduce costs for idle periods, as you've already paid for the reservation.