solution in unavailable?

What are your options if an out-of-the-box integration SAP S/4HANA Cloud, public option and an SAP

solution in unavailable? There are 3 correct answers to this question.
A . Integration tools
B . Whitelisted APIs
C . Infrastructure as a Service
D . SAP Best Practices integration packages
E . Unrestricted firewall

Answer: A,B,D