Which 3 considerations are needed prior to a SF Connect implementation?

NTO processes orders from its website via an order management system (OMS). The OMS stores over 2 million historical records and is currently not integrated with SF. The Sales team at NTO using Sales cloud and would like visibility into related customer orders yet they do not want to persist millions of records directly in Salesforce. NTO has asked the data architect to evaluate SF connect and the concept of data verification.

Which 3 considerations are needed prior to a SF Connect implementation? Choose 3 answers
A . Create a 2nd system Admin user for authentication to the external source.
B. Develop an object relationship strategy.
C. Identify the external tables to sync into external objects
D. Assess whether the external data source is reachable via an ODATA endpoint.
E. Configure a middleware tool to poll external table data

Answer: B,C,D