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In a serverless game application using AWS Lambda and API Gateway, which solution should a developer implement for user registration and login on a web sign-in page to minimize operational overhead and ongoing identity management?
A
Utilize Amazon Cognito for user pools with external social identity providers and IAM role configuration.
B
Implement sign-in page functionality to create IAM groups for users and attach IAM roles.
C
Establish an Amazon RDS SQL Server instance for user storage and backend resource permission management.
D
Enable the sign-in page to handle user registration, storing user data and passwords in an Amazon DynamoDB table with IAM policy attachment.
