Answer: Advisory
Step-by-step explanation:
A staff with advisory authority is a professional that has years of experience or expertise and provides consultancy services when called upon. If and when members of an organization (such as a line manager) encounter issues that are beyond their expertise, it's the job of an advisor to provide advice on a course of action to be taken. The advisor assists the leader/organization in formulating long-range goals and in planning and initiating short term projects and as such help management (line managers) make decisions.