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AWS Certified Solutions Architect - Associate · AWS
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
AWS Lambda Function URLs provide: - A built-in HTTPS endpoint (no API Gateway needed) - Native support for AWS_IAM authentication - Minimal configuration and no additional infrastructure - Lowest operational overhead Amazon API Gateway works, but: - More configuration (routes, stages, deployments) - Higher operational overhead than Lambda Function URLs - Not the “most efficient” solution when Lambda URL supports IAM directly So A is valid but not optimal.
Lambda Function URL (with AWS_IAM authentication) is more operationally efficient than an Amazon API Gateway REST API (with Lambda proxy integration + IAM authorization enabled). docs.aws.amazon.com
Going with B. Lambda function would be most operationally efficient and does not need any additional service like API gateway or load balancers.