Given the following activity network: A2 A1 Ki A3 Activity Al takes 5 weeks. A2 takes 7 weeks, and A3 takes 4 weeks with a 50% probability and 10 weeks with a 50% probability. What is the project completion time under the worst-case scenario, that is. A3 is late and takes 10 weeks?
a. 12 weeks
b. 9 weeks
C. 10 weeks
d. 15 weeks