Final answer:
The executive position most aligns with the behavior of inspiring staff to achieve the organization's mission, which showcases a blend of leadership function and motivation.
Step-by-step explanation:
According to Gardner's tasks of leading/managing, the behavior suitable for an executive position is to inspire the staff to achieve the mission of the organization. An executive's role is not just to manage tasks but also to motivate and unify their team towards a common objective, reflecting the essence of leadership function. The executive should be skilled at harnessing the collective energy of the employees to drive the organizational mission forward. This requires strong communication, inspiration, and strategic thinking capabilities.