Final answer:
A salesperson should give a customer the agency disclosure form when they are acting as an agent for the customer.
Step-by-step explanation:
A salesperson should give a customer the agency disclosure form when they are acting as an agent for the customer. This typically occurs when the salesperson is representing the customer in a real estate transaction or when the salesperson is providing professional advice or recommendations to the customer. The agency disclosure form is a legal document that informs the customer about the relationship between the salesperson and the customer, as well as any potential conflicts of interest.