Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 803 discussion

Picked A because cognito user pool => authentication

AnswerA Adaptive authentication Amazon Cognito can review location and device information from your users' sign-in requests and apply an automatic response to secure the user accounts in your user pool against suspicious activity. When you activate advanced security, Amazon Cognito assigns a risk score to user activity. You can assign an automatic response to suspicious activity: you can Require MFA, Block sign-in, or just log the activity details and risk score. You can also automatically send email messages that notify your user of the suspicious activity so that they can reset their password or take other self-guided actions. https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-pool-settings-adaptive-authentication.html

With adaptive authentication, you can configure your user pool to require second factor authentication in response to an increased risk level. To add adaptive authentication to your user pool, see Adding advanced security to a user pool.https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-pool-settings-advanced-security.html

A is correct B is wrong beacause is desing for temporary credentials

I belive it's A

accommodate millions of users and GEO, IP, etc. I think A