Which issue do you address by simulating a data source?

Which issue do you address by simulating a data source?
A . The product database moves to a new data source accessible by a web service that is not yet configured.
B . You need to test a save plan for a savable data page that updates the cost of coverage options for insurance policies
C . In production, the customer database needs to be taken off-line overnight for scheduled maintenance.
D . An Embedded data field needs simulated data for testing a customer creation view.

Answer: A