A retailer built a serverless app that runs an AWS Lambda function to compute order success rates and saves results in a DynamoDB table. A developer needs a simple way to invoke the Lambda every 15 minutes. Which option satisfies this with the least development effort?

The most straightforward and serverless solution for invoking a Lambda function on a recurring schedule is using Amazon EventBridge (formerly CloudWatch Events). An EventBridge rule with a rate(15 minutes) expression directly triggers the Lambda function as its target, requiring minimal configuration and no additional infrastructure. Creating an AWS Systems Manager document or provisioning an EC2 instance with a cron job introduces unnecessary compute resources and management overhead for a simple scheduled task. While AWS Step Functions can schedule tasks, using a Wait state for a fixed interval is less efficient and more complex than a direct EventBridge rule for this specific use case. EventBridge is designed precisely for this type of event-driven scheduling.