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How can a developer ensure that all requests to a web API, served by an internet-facing Application Load Balancer (ALB) with an HTTPS listener and secured by an Amazon Cognito user pool, are authenticated?
A
Implement a listener rule to return a 401 Unauthorized response if the Authorization header is absent.
B
Configure the ALB's listener rules to authenticate requests using Cognito, denying access for unauthenticated requests.
C
Utilize Amazon API Gateway with an authorizer set to the Cognito user pool for all API methods, forwarding them to the ALB endpoint.
D
Integrate a Lambda function within a new target group to validate the Authorization header against Amazon Cognito, linking this group to the listener.
