Final answer:
The guiding principle in the scenario is 'Collaborate and promote visibility,' which includes teamwork, alignment of ideas, and transparent communication to enhance service acceptance.
Step-by-step explanation:
In the scenario described, where a team is formed from various departments to design a service that meets the needs of all the departments and aims to ensure broader acceptance of the service, the guiding principle that best describes this situation is b. Collaborate and promote visibility. Collaboration entails constructive teamwork between stakeholders from different departments, ensuring that ideas are aligned and promoting mutual trust. Promotion of visibility involves being open and transparent during the process, which fosters a sustainable environment for the service's acceptance across the organization. This approach supports identifying common values, adapting to needs, and incorporating feedback for improvement.