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Salesforce Certified Data Architect · Salesforce
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Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
Not A - Creates a dependency on Salesforce as the central identifier and limiting flexibility. Not C - Adds complexity and increases data management overhead. Not D - Unnecessary complication if a suitable identifier already exists in the MDM solution. B - Leverages the MDM as the master source, adds flexibility and it's easy to implement.
B, because the external Id should align to the Id in the MDM solution. The MDM solution is meant for being the source of truth. Not A because Salesforce IDs should never be hard coded, even as an external Id. Not C, a custom object to store a customer Id offers no benefits for data matching records so that the MDM can maintain the record. Not D, a MDM solution was already stated exists.