14.2 Nat Chelnick has to go on an unexpected but urgent business trip to a city in Central Asia. The arrangements he has to make are: Activity Description Precedence Duration (days) A Renew his passport 8 B Obtain a visa A 10 C Go for vaccination shots+ 6 D. EFS E F Order and receive currency Order and receive tickets Book accommodation G Book airport parking IBEE 4 1 3 2 + Includes time to allow for side-effects of vaccine Compile a network for this venture and, using it, find how long Nat will have to wait before he can make the trip, and state which activities are critical.