A project manager for a large construction company is responsible for the construction of a new football stadium. Over 100 different vendors are involved.

The lead scheduler provided the project manager with an integrated schedule. The schedule had taken weeks to develop and would require close management. The project has four critical paths. One critical activity on the schedule is pouring the concrete. Once poured, the concrete will require five to seven days to cure. During this timem many team members will take a short vacation, since they have been working around the clock. Curing of the concrete is an example of:

a. float

b. free float

c. lead

d. lag