Five jobs are ready for processing at time zero through a workstation. The details regarding the processing time and the due

date of completion is provided in the following table.

Using the earliest due date $($EDD$)$ rule, the average tardiness of the five jobs is:

a$.$ more than $0\mathrm{.}5$ but less than or equal to $0\mathrm{.}7$ day.

b$.$ more than $0\mathrm{.}3$ but less than or equal to $0\mathrm{.}5$ day.

c$.$ more than $0\mathrm{.}7$ but less than or equal to $0\mathrm{.}9$ day.

d$.$ more than $0\mathrm{.}1$ but less than or equal to $0\mathrm{.}3$ day.