What should be done to enable the retrieval of the access token status for the OpenID Connect connection?

Universal Containers isusing OpenID Connect to enable a connection from their new mobile app to its production Salesforce org.

What should be done to enable the retrieval of the access token status for the OpenID Connect connection?
A . Query using OpenID Connect discovery endpoint.
B. A Leverage OpenID Connect Token Introspection.
C. Create a custom OAuth scope.
D. Enable cross-origin resource sharing (CORS) for the /services/oauth2/token endpoint.

Answer: B