Five jobs are ready for processing at time zero through a workstation. The details regarding the processing time and the due date of completion are provided in the following table.

Job	Processing Time (days)	Days Due from Today
A	11	35
B	10	39
C	7	34
D	8	42
E	12	40

Using the shortest processing time (SPT) rule, it can be concluded that the average tardiness for the five jobs is:

a. more than 1.2 but less than or equal to 1.5 days.

b. more than 1.5 but less than or equal to 1.7 days.

c. more than 1.7 but less than or equal to 1.9 days.

d. more than 1.9 but less than or equal to 2.1 days.