(2) Four jobs, A, B, C, and D have to be done on two machines, M1 and M2, in the same sequence, M1 first then M2. The operation times in hours and the due dates are given in the table. Draw Gantt charts showing the scheduling of these jobs based on: (a) Johnson's Rule. 10 (b) Shortest Processing Time. 10 (c) Earliest Due Date. 10