the question is based on critical path analysis

The table below shows the activities, precedence and durations required to complete the execution of a project to build and install an Air Pollution Device. ACTIVITY DESCRIPTION IMMEDIATE TIME (WEEKS) PREDECESSORS A BUILD INTERNAL COMPONENTS - 2 B MODIFY ROOF AND FLOOR - 4 C CONSTRUCT COLLECTION STACK A 2 D POUR CONCRETE AND INSTALL FRAME A, B 4 E BUILD HIGH TEMPERATURE BURNER C 6 F INSTALL POLLUTION CONTROL SYSTEM C 4 G INSTALL AIR POLLUTION DEVICE D, E 5 H INSPECT AND TEST F, G 3 TOTAL TIME (WEEKS) 30 1. Discuss the various phases ofthe project life cycle that has been undertaken before arriving at this phase of execution. 2. Draw a network diagram ofthe activities shown in the table 3. Calculate and insert in the network diagram, the Earliest Start (ES), Earliest Finish (EF), Latest Start (LS) and the Latest Finish (LF) times of each ofthe activities 4. Identify the critical path for this project and explain why the activities on the path are critical