Needed ASAP

A simple CPM network has three activities, A, B, and C. A is an immediate predecessor of B and of CB is an immediate predecessor of C. The activity churations * A=4,8-30-5 OA. The network has no critical path. B. The critical path is A-B-C, duration 12 OG. The cal path to ABC durion 9 OD. The critical path cannot be determined without knowing PERTxpected activity men OE The critical path AC, duration 105