Final answer:
The unique sugar-free desserts developed by the healthcare foodservice department represent signature branding, where a distinct product is closely associated with the brand and serves as an exclusive offering from the company. The correct option is d.
Step-by-step explanation:
The healthcare foodservice department's high-quality, sugar-free desserts that are unique to the department represent signature branding. Signature branding refers to a situation where a company creates a distinct product, which is closely associated with its brand, and can be identified as an exclusive offering from that particular company or department. In this case, the desserts are not generic but are uniquely identified with the foodservice department, distinguishing them from competitors' offerings and enhancing the department's brand identity.