A project plan is established o a. before project activities begin b. before project activities begin and is modified as time goes on and conditions change O c. dynamically, as conditions change o d. before project organization Exhibit 15.1 The following questions employ the AON network and partial spreadsheet below. B G3 A4 D7 F12 B D G H Activity Description Predecessor Time EST EFT LST LFT Slack A Activity A 4 0 4 0 4 B 7 Activity B 4 Activity A 2 4 6 5 7 5 D Activity D ? 7 2 ? ? 2 6 E Activity E D 1 14 15 15 16 F Activity F D 2 14 16 14 16 G Activity G E.FI 16 191 16 19 Refer to Exhibit 15.1. What values are placed in cell C5 of the spreadsheet? O a. C O b. E, F O c. B O d. B, C Which activities are critical in the following diagram? start B3 E 1 finish A4 C2 D7 F2 o a. A, C, D, E o b. B, D, E OC. A, C, D, F O d. A, B, D, E, F