Answer: Amazon Cognito user pools

The correct answer is C - Amazon Cognito user pools. Amazon Cognito user pools provide user identity management and authentication for your application. They allow you to create and maintain a user directory, and you can enable social identity providers like Facebook, Google, or Amazon to allow users to register and log in using their social media accounts. This service is specifically designed for user management and authentication scenarios like the one described.

Author: LeetQuiz Editorial Team