In order to be useful as schedule building blocks, activities should have certain characteristics. Which of these is NOT a characteristic that an activity should have?

a$.$ Output can be independently verified and measured.

b$.$ Work component at the lowest level of the WBS$,$ for which cost and duration can be estimated and managed.

c$.$ Resources, cost, and time can be estimated exclusively.

d$.$ Defined start and end points

$0=$ Icon Key