Which approach does SAP recommend?

You need to create an SAP Business Warehouse data flow that combines data from two sources in an advanced Datastore object (DSO) There are different and value for the same entry in the source.

Which approach does SAP recommend? Please choose the correct answer.
A . Create an open ODS as a non-persistent intermediate layer to perform a join from the source dependent parts need to be implemented in the same transformation.
B. Create a composite provider as a non-persistent intermediate layer to perform a join from the source the source-dependent parts need to be implemented in the same transformation.
C. Create an infosource as a non-persistent intermediate layer.the source-dependent parts of the a transformation need to be implemented before the info source.
D. Create an infoset as a non-persistent intermediate layer.the source-dependent parts of the transformation need to be implemented before the info set.

Answer: B