Which of the following best describes a trademark?

A trademark specifically refers to a sign, symbol, logo, word, or combination of these that distinguishes the goods or services of one entity from those of others. It represents the brand identity of a service or product and ensures that customers can identify and differentiate the source of a service quickly, which adds value and trustworthiness to that service. The exclusive rights granted by a trademark allow the holder to protect their brand against unauthorized use by others, ensuring that their market presence and reputation remain intact.

This makes the choice related to an exclusive right for service identification the most accurate, as trademarks are primarily about distinguishing services or products in the marketplace. This form of intellectual property is essential for businesses and organizations to maintain their unique identity and branding in competitive environments.

The other choices do not accurately define a trademark: a temporary registration of works relates more closely to copyright; a permanent legal status for physical products suggests a broader scope that would apply more to patents; and a right for the title of a book is specifically a copyright issue, not concerned with the branding and identification aspect that trademarks cover.