Which solution will meet these requirements?
Use the Instance Scheduler on AWS to configure start and stop schedules.
Turn off automatic backups. Create weekly manual snapshots of the database.
Create a custom AWS Lambda function to start and stop the database based on minimum CPU utilization.
Purchase All Upfront reserved DB instances.
Explanations:
Instance Scheduler on AWS can automate start/stop schedules, aligning database availability with weekday business hours, reducing costs when the database is idle.
Turning off automatic backups only reduces minimal cost, and manual snapshots increase operational overhead, not addressing scheduling needs.
CPU-based scheduling with Lambda requires custom coding and maintenance, adding complexity without fully aligning with business-hour needs.
Reserved instances require upfront commitment and are cost-effective only with constant usage; they do not fit intermittent, weekday-only usage patterns.
I infer that the answer is:
Use the Instance Scheduler on AWS to configure start and stop schedules.