Match Cognito components to use cases

Amazon Cognito has two distinct building blocks that are easy to confuse. A User Pool is a user directory that handles sign-up and sign-in and issues JSON Web Tokens (ID, access, and refresh tokens) to authenticated users. An Identity Pool (federated identities) does something different: it takes a token proving who a user is and exchanges it for temporary AWS credentials so the user can call AWS services directly. Classify each use case under the Cognito component that handles it.