What are the possible approaches for setting up the system landscape?

You are starting a new implementation project for SAP IBP and are considering the possible system architecture.

What are the possible approaches for setting up the system landscape? Note: There are 2correct answers to this question
A . Setup the two-tier landscape and have the configuration for development system regularly ― updated from the production system
B . Create additional planning areas in the test system to support training needs.
C . Create additional test planning areas in the production system to support cutover needs
D . Set up a three-tier landscape using transport, starting from the development system to test and ― production

Answer: B, D