A company must perform a maintenance service project consisting of seven activities. The activities, the predecessors, and respective time estimates are presented below. Using the Single Time Estimate CPM procedure, which activities make up the critical path? Immediate Activity Designation Predecessor Time in Hours Break down machines A None 3 Clean machine 1 B A 3 Clean machine 2 C A 3 Re-set machine 1 D B 4 Re-set machine 2 E C 2 Re-calibrate machines F D and E 1 Final test G F 2.