Which two solutions should an Integration Architect recommend to handle this requirement?

Cases

Salesforce is considered to be the system of record for the customer. In addition to Salesforce, customer data exists in an Enterprise Resource Planning (ERP) system, ticketing system, and enterprise data lake. Each of these additional systems have their own unique identifier. UC plans on using middleware to integrate Salesforce with the external systems.

UC has a requirement to update the proper external system with record changes in Salesforce and vice versa.

Which two solutions should an Integration Architect recommend to handle this requirement? Choose 2 answers
A . Locally cache external ID’S at the middleware layer and design business logic to map updates between systems.
B. Store unique identifiers in an External ID field in Salesforce and use this to update the proper records across systems.
C. Use Change Data Capture to update downstream systems accordingly when a record changes.
D. Design an MDM solution that maps external ID’s to the Salesforce record ID.

Answer: C,D