AWS Certified Developer – Associate (DVA-C02) — Question 209

An online sales company is developing a serverless application that runs on AWS. The application uses an AWS Lambda function that calculates order success rates and stores the data in an Amazon DynamoDB table. A developer wants an efficient way to invoke the Lambda function every 15 minutes.

Which solution will meet this requirement with the LEAST development effort?

Answer options

• A. Create an Amazon EventBridge rule that has a rate expression that will run the rule every 15 minutes. Add the Lambda function as the target of the EventBridge rule.
• B. Create an AWS Systems Manager document that has a script that will invoke the Lambda function on Amazon EC2. Use a Systems Manager Run Command task to run the shell script every 15 minutes.
• C. Create an AWS Step Functions state machine. Configure the state machine to invoke the Lambda function execution role at a specified interval by using a Wait state. Set the interval to 15 minutes.
• D. Provision a small Amazon EC2 instance. Set up a cron job that invokes the Lambda function every 15 minutes.

Correct answer: A

Explanation

Option A is the best choice because it uses Amazon EventBridge, which is designed for scheduled events and requires minimal setup. The other options involve more complex configurations, such as managing EC2 instances or creating state machines, which would increase the development effort unnecessarily.