Answer: Amazon Cognito

The correct answer is Amazon Cognito (Option C). Amazon Cognito is an AWS service specifically designed for managing user authentication and authorization in web and mobile applications. It supports user sign-up, sign-in, and access control, and can integrate with social identity providers like Apple, Facebook, Google, and Amazon, as well as enterprise identity providers via SAML 2.0 and OpenID Connect. This makes it the ideal choice for applications that require both direct user sign-in with a username and password, and the ability to sign in through third-party providers.

Author: LeetQuiz Editorial Team