A small project consists of 4 activities, A, B, C & D. Activity A is the first one and it is immediately followed by activities B & C. Thus, the immediate predecessors to B & C is A. Activity D follows Activities B & C so that D's immediate predecessor is both B & C. Given the time estimate of each activity shown below, what is the early start time for activity D? A B C D Time 2 8 8 4 Predecessor none A A B,C