Oliver works at Tate Corp., an apparel manufacturing company. He primarily focuses on the tastes and needs of the firm's customers. He achieves this by managing a team that regularly interacts with customers through various promotional activities and events. He also provides insights on how to produce eco-friendly outfits through cost-efficient manufacturing processes. This implies that Oliver:______.
a. belongs to the external labor market.
b. is a knowledge worker.
c. encourages centralized decision making.
d. encourages a narrow business focus.
e. is an HR professional.