How do you ensure that each customer name appears only once in the results?

You combine two customer master data tables with a union node in a calculation view. Both master data tables include the same customer name.

How do you ensure that each customer name appears only once in the results?
A . Define a restricted column in a union node.
B. In the union node, map both source customer name columns to one target column.
C. Include an aggregation node above the union node.
D. Add an intersect node above the union node.

Answer: C