What should the Salesforce Admin do in the Communities to support this login requirement?
Universal Containers needs to use their corporate portal to authenticate Community users, allowing users access to the Community after they have successfully logged into the Portal.

A. Enable Guest User access in Communities to support seamless access to Communities from the Portal.

B. Add Social -Sign -on to allow users to log in from the Portal without signing into the Community.

C. Configure Single Sign-on in Salesforce and reuse the federated authentication providers in the Community.

D. Enable Community login support for employees in the Portal configuration.