In a 2-tier ERP scenario, which integration technologies can you use?

You need to integrate the headquarters of a company running on SAP S/4HANA with a subsidiary running on SAP S/4HANA Cloud.

In a 2-tier ERP scenario, which integration technologies can you use? Note: There are 2 correct answers to this question.
A . SAP Cloud Connector
B . SAP Open Connectors
C . SAP Cloud Integration Automation Service
D . SAP Process Orchestration

Answer: A, D