Which type of mark indicates that a specific service is being provided?

A service mark is a specific type of trademark that identifies and distinguishes the source of a service rather than a product. It is used by businesses to signal to consumers that their service comes from a specific provider, thereby providing a level of assurance about the quality and nature of that service. The term "service" encapsulates various forms of activity performed for the benefit of consumers, such as legal services, consulting, or educational services.

In contrast, a collective mark pertains to marks used by members of a group or organization to signify their membership and common characteristics, while a certification mark is used to indicate that services or products meet a set standard of quality, origin, or other specifications established by the mark's owner but is not used by the owner to sell services directly. Trade dress, on the other hand, refers to the visual appearance of a product or its packaging, which can also be trademarked to signify the source of the product, but does not pertain specifically to services.

Therefore, the choice of a service mark directly aligns with identifying and promoting a specific service, making it the most applicable answer to the question.