23. You're managing a software project. You've created the schedule, and you need to figure out which activities absolutely cannot slip. You've done critical path analysis, identifying the critical path and calculating the early start and early finish for each activity. Which activities cannot slip without making the project late? A. The ones with the biggest difference between ES and LF B. The activities on the critical path C. The activity with the most lag D. The last activity in the project, because it has no float