Based on this system configuration, where would the developer find the logs?

Explanations:

Amazon S3 is a storage service for objects and files but does not store logs for Lambda functions. Logs generated by Lambda are not available in S3 unless explicitly configured to send logs there, which is not the default behavior.

AWS CloudTrail is a service that logs API calls and account activity across your AWS infrastructure, but it does not capture application-level logs or Lambda function logs. It is useful for tracking changes but not for debugging application behavior.

Amazon CloudWatch is the correct service for viewing logs generated by AWS Lambda functions. By default, Lambda automatically sends logs to CloudWatch, where developers can monitor, search, and analyze log data, making it the appropriate choice for examining Lambda function logs for errors.

Amazon DynamoDB is a NoSQL database service used to store application data but does not provide logging for Lambda functions. Any errors or logs related to the execution of the Lambda functions would not be found in DynamoDB.