Reliable Construction has just made a winning bid to construct a new plant for a major manufacturer. Activity Description Immediate Predecessor Time (in weeks) A Excavate START 2 B Lay the foundation 4 Put up the rough wall B 10 D Put up the roof C 6 E 4 E 5 G Install the exterior plumbing Install the interior plumbing Put up the exterior siding Do the exterior painting Do the electrical work D 7 . E.G 9 7 J Put up the wallboard F, 8 K Install the flooring J 4 L Do the interior painting J 5 M Install the exterior fixtures H 2 N Install the interior fixtures KAL 6 1. The critical path is 2. The duration is 3. The EF at node Fis 4. The ES at node Jis 5. The LS at node C is