You have to prepare the schedule for a project in which the key resources is a tractor. There are 3 tractors available to the project. Activities A and D require one tractor to complete while Activities B,C,E and F require 2 tractors. Develop a resource-constrained schedule in the loading chart that follows. Use the parallel method and heuristics given. Be sure to update each period as the computer would do. Record the early start (ES), late finish (FL) and slack (SL) for the new schedule. (15 M)