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Which AWS-managed solution offers minimal operational overhead for controlling access to a REST API used by an application hosted on AWS, leveraging Amazon Cognito for user management?
A
AWS Lambda function as an API Gateway authorizer for user request validation.
B
API key assignment and validation for each user via an AWS Lambda function.
C
User email address in request headers validated by an AWS Lambda function for access rights.
D
Amazon Cognito user pool authorizer in API Gateway for Amazon Cognito-based request validation.
