Which AWS service should be used to meet these requirements?

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A Developer is creating a mobile application with a limited budget. The solution requires a scalable service that will enable customers to sign up and authenticate into the mobile application while using the organization’s current SAML 2.0 identity provider.

Which AWS service should be used to meet these requirements?
A . AWS Lambda
B . Amazon Cognito
C . AWS IAM
D . Amazon EC2

Answer: B