We can use Johnson's rule for scheduling if following conditions are satisfied. A. There are only 2 machines. B. All jobs must spend some time at each of 2 machines. C. All jobs must first go Machine 1 and then on Machine 2. Which of the statement is correct.
a. A, B, and C must be satisfied.
b. A and B must be satisfied, C does not have to be satisfied.
c. B and C must be satisfied, A does not have to be satisfied.
d. A and C must be satisfied, B does not have to be satisfied.
e. none of these have to be satisfied.