A DataStream includes two different data sources: "Golf Equipment" and "Other Equipment." For each incoming row, the developer wants to add a value that indicates the data source that the row comes from. What should the developer do?
A. Create a static member for each data source in the underlying hierarchy.
B. Add a literal to each data source that references the data source name.
C. Specify the source identity property for each data source in the DataStream.
D. Add a derivation to the transformation model to create a new column.
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