In the following example of a project schedule, the total duration is listed as 67 days; however, there are 117 calendar days between January 1st and April 28th. Why does the project's "Duration" column not exactly match the number of calendar days between the scheduled start and finish dates? Project Schedule Duration Question 13 options: The duration includes additional days for contingencies The duration only includes production days The duration only counts days on the critical path The duration only counts the number of working days