Among the options you provided, the skill that is most relevant and important for administrative professionals is (b) health insurance.
Administrative professionals often play a crucial role in managing and coordinating various aspects of an organization, including employee benefits such as health insurance. Having knowledge of health insurance enables them to assist employees with understanding their coverage, processing claims, and resolving any issues or concerns related to health insurance plans.
While knowledge of vital signs, anatomy, and vaccinations can be valuable in certain healthcare-related roles, they are not typically considered essential skills for administrative professionals in most industries. However, it's worth noting that the specific requirements for administrative professionals can vary depending on the nature of the organization and the industry they work in.