What configuration steps are necessary?

You want to configure legacy applications (Web Dynpro/ABAP transactions) to run on SAP fiori Launchpad in a central hub deployment .

What configuration steps are necessary? There are 2 correct answers to this question.
A . Define the HTTPS and RFC connections to the BES in the FES system
B . Define HTTPS and RFC connections to the FES system in the BES system.
C . Activate the ICF nodes for web Dynpro ABAP in the FES system
D . Activate the ICF nodes for web dynpro ABAP in the BES system

Answer: A,D