Eleven activities and eight events constitute a certain research and development project. The activities and their expected completion times are as follows :
Activity
Completion Time in Weeks
A → B 5

A → C 6

A → D 3

B → E 10

B → F 7

C → E 8

D → E 2

E → F 1

E → G 2

F → H 5

G → H 6

a. Represent the project in the form of an activity–event network.
b. Calculate TE and TL for each event and label each with TE, TL, and S.
c. Identify the critical path and calculate the shortest possible time for project completion.