As a project manager, you are given the actual cost (AC), earned value (EV), and planned value (PV) in the following activities. Identify which of these activities most deserves your attention, by ranking the four activities from most important to least important. Ensure that you justify your answer by showing your calculations for each activity, and also by explaining your reasoning for the importance that you have decided to give each of these activities. Activity A: AC = $1,600 and EV = $1,500 Activity B: AC = $4,000 and EV = $3,900 Activity C: PV = $3,000 and EV = $2,800 Activity D: AC = $2,400 and EV = $3,000 [12 marks