The following table contains order-dependent setup times for four jobs. For safety reasons, job C cannot follow job A, nor can job A follow job C. Determine the processing sequence that will minimize the total setup time. (Hint: There are 12 alternatives.)

Following Job’s Setup Time (hrs.)
Setup Time (hrs.) A B C D Preceding job A 2 — 5 × 4 B 1 7 — 3 2 C 3 × 2 — 2 D 2 4 3 6 — LO.1