What are some responsibilities of the Configuration Expert project team role in an SAP S/4HANA Cloud implementation?

What are some responsibilities of the Configuration Expert project team role in an SAP S/4HANA Cloud implementation?
A . Resolution of business process issues
B . Serves as the central contact for SAP
C . Prepares and leads the Fit-to-Standard analysis process
D . Manages interactions with the SAP Service Center

Answer: A,C