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 arrangement
B. Communication interface
C. Communication API
D. Communication user
E. Communication system

Answer: A,D,E