To use ODI efficiently in a Data Warehouse project is it necessary to have a topology with an intermediate transformation server?

To use ODI efficiently in a Data Warehouse project is it necessary to have a topology with an
intermediate transformation server?

A.
It is mandatory to have an intermediate server.

B.
It is better to load data directly from sources into a data warehouse server.

C.
Data transformation should be distributed across several scalable nodes.

D.
It is mandatory to collect data directly from sources into a data warehouse server using real
time replication processes.

Explanation: