A project for improving a billing process has the following precedence relationships and activity times: Activity Immediate Predecessor(s) A Activity Time (weeks) 5 7 7 B A B, C D 11 E 11 B F 5 D G 6 E F G H 7 a. Choose the correct network diagram below. OB. H S F 11 11 OC OD H S 11 G G B 7 B 7 11 b. Calculate the slack for each activity. Which activities are on the critical path? Activity Activity Time (weeks) On critical path? Slack (weeks) A 5 B 7 ODOC 7 11 B D 11 7 11 6 b. Calculate the slack for each activity. Which activities are on the critical path? Activity Activity Time (weeks) On critical path? Slack (weeks) A 5 B 7 C 7 D 11 E 11 F 5 G 6 H 7