Final answer:
An originator's unique identifier must be shown on all documents except Mortgage Loan Applications.
Step-by-step explanation:
An originator's unique identifier must be shown on all but Mortgage Loan Applications among the following documents: Business Cards, Advertisements, and Business Signage.
Mortgage Loan Applications typically do not require an originator's unique identifier because they are internal documents used within the lending institution, whereas the other listed documents are meant for external communication and representation.