5. A firm has two workers: Paula and Carlo. Equations that represent each of their PPFs for counseling clients (C) and writing memos (M) per working day are: Paula: C = 12 - 4M Carlo: C = 6 - 3M a. Paula's opportunity cost of counseling one client is b. Carla's opportunity cost of counseling one client is c. The opportunity cost of counseling is lower for implying that he/she has advantage in the task. d. The firm needs to produce 3 memos per day, and would like to counsel as many clients as possible. The maximum number of clients the firm can counsel in a day (if it allocated the tasks efficiently) is equal to