Which data source should the team use to make progress on the design?

A consultant wants to proceed with a FlexCard canvas design that will display data from a legacy billing system. The legacy billing system is being extended to add a SOAP endpoint that will allow for the data to be retrieved in XML format. However, the endpoint is not ready yet.

Which data source should the team use to make progress on the design?
A . DataRaptor
B . Apex REST
C . Integration Procedures
D . Apex Remote

Answer: C