Which solution will meet these requirements with the LEAST operational overhead?

Explanations:

While creating a reminder in Amazon EventBridge could trigger a scale action, it does not directly manage the scaling of instances. This would require additional steps to implement, leading to more operational overhead than necessary.

Creating an Auto Scaling group with a scheduled action allows for automated scaling of instances based on a specific schedule (every Friday evening). This minimizes operational overhead by automating the scaling process, ensuring the correct number of instances are available when needed.

Manual scaling requires human intervention to adjust the number of instances, which increases operational overhead. The company needs a solution that automatically adjusts the instance count to meet workload demands.

Automatic scaling is typically based on metrics or thresholds rather than a fixed schedule. In this scenario, where scaling is required on a specific schedule, a scheduled action in an Auto Scaling group (option B) is more appropriate.