Asa is the chief executive officer of Hoku Corporation. Asa's responsibilities include decisions on product development, marketing, and other significant business directions. Asa is subject to the approval and oversight of Hoku's board of directors. Maile is a Hoku manager whose duties include the firm's day-to-day hiring, firing, purchasing, and selling. Kimo is a Hoku salesperson, whose daily activities are controlled by Maile. Ralph writes technical manuals for Hoku products according to Asa's instructions and subject to Hoku's control, but has no dealings with Hoku customers or suppliers. Mary edits the manuals on a contract-per-manual basis and is not otherwise subject to Hoku's control. (1) Who is a (are) principal(s)? (2) Who is an (are) agent(s)? (3) Who is an (are) employee (s)? (4) Who is an (are) independent contractor (s)? NOTE: A person may have more than one role, and several people may have the same role.