Given is a PERT project network diagram as shown below. A F Start E H End B D D G I Activity Start Time 0 A 3.12 B 2.34 C 6.12 JE 6.21 G 12.38 End 0 4.36 4.23 4.78 a) The Project Completion time = (in 2 decimal places) b) The Earliest Start time. ES, of Activity G= (in 2 decimal places) c) The Latest Finish time. LF, of Acitivity C = (in 2 decimal places) d) The critical activities are = (ex. type in critical activities as ABCD, no comma, no space)