Answer:
Upper level manager.
Explanation:
I believe you are missing one of the options, which is the correct one in fact. The most important decisions within a company, such as the aforementioned devising strategies to deal with potential problems, and making sure the company is on a right path, are made by the upper level management. Based on the performance of these managers, the company will either be successful or not, in which case the work of said managers will be inspected.