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

Answer: A,B,C