What must you create when you build a communication scenario in SAP S/4HANA Cloud? Note: There are 3 correct answers to this question.

What must you create when you build a communication scenario in SAP S/4HANA Cloud? Note: There are 3 correct answers to this question.
A . Communication API
B. Communication user
C. Communication interface
D. Communication arrangement
E. Communication system

Answer: B,D,E