Built into the IBM Watson Discovery service is the Watson Discovery News data set. How is this collection different from other collections?

A. The Watson Discovery News configuration and documents cannot be adjusted

B. Documents from the Watson Discovery News collection can be ingested as sample documents to better configure a private collection

C. The Watson Discovery News collection is specific to the company news domain, whereas a collection is specific to a domain.
D. The Watson Discovery News data set and a private collection can be queried with a single query call