Which action is required by a dealer when advertising prices?

When advertising prices, it is essential for a dealer to include disclaimers for any additional costs. This requirement ensures transparency and protects consumers from misleading pricing. By clearly stating any additional fees that may apply—such as taxes, dealer fees, or other associated costs—advertisers help potential buyers understand the total cost they may incur when purchasing a vehicle. This practice aligns with fair advertising standards and helps build trust with customers, thereby promoting ethical business practices in the automotive industry.

The other choices fail to meet the standards of clear and honest advertising. Simply listing prices without fees can mislead consumers, and showing only a discounted price may not reflect the true cost of the vehicle. Not providing a contact number, while helpful in some contexts, does not address the crucial need for clarity about the total pricing structure in vehicle advertisements.