Which best practice should the consultant recommend?

Cloud Kicks (CK) has an external enterprise resource planning(ERP) system that stores product order information. CK wants to view those orders as a related list on the account record in real time.

Which best practice should the consultant recommend?
A . Implement Salesforce Connect and an external object to get real-time product order information, and add the external object as a related fist on the Account.
B. Create a Lightning component, and get the real-time product order information from ERP using REST integration.
C. Create external object product onto" information in Salesforce, run a nightly batch to get details from ERP, and add the external object as a related fist on the Account.
D. Implement Salesforce-to-Salesforce to get real-time product order information, and add it as a related list on the Account.

Answer: A