What service can provide support for the application to allow guest access?

A Developer is creating a web application that requires authentication, but also needs to support guest access to provide users limited access without having to authenticate.

What service can provide support for the application to allow guest access?
A . IAM temporary credentials using AWS ST
C . Amazon Directory Service
D . Amazon Cognito with unauthenticated access enabled
E . IAM with SAML integration

Answer: C

Explanation:

Reference: https://aws.amazon.com/cognito/faqs/