Consider the following table of activities A through E in which A is the start node and E is the stop node. Assume all activities require the same resource. Activity Duration (days) Predecessor A 5 - B 5 A C 10 A D 4 A E 5 B, C, D Assume the project is resource-constrained but not time-constrained. Assume only one resource is available and that resource can only do one activity at a time. Activities B, C and D all have the same early start date (time). Since there is only one resource, only one of the activities B, C, D can be started on the early start date. Which should be started first? Select one: O a. Activity D O b. Activity C O c. Activity B O d. Either activity B or activity D O e. Both activities B and D