I've got a good feeling about this. The non-equi join is used when the join condition is not a simple equality comparison between columns. Gotta remember that for the exam.
I think the key here is understanding the roles of each Salesforce product. B2C Commerce is likely where the customer account is created, so that's probably where the customer ID is generated. The primary record could then be created in one of the other systems.
I believe the answer could also be D) Join columns need to be ignored when NOT requested by the query, as sometimes we only want to include certain columns in the result.
Jacklyn
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