Which is the best statement regarding work breakdown$$ structure?

Part $2$

A$.$

A Level $1$ activity is a more micro view$($greater level of$$ detail$)$ than a Level $2$ activity.

B$.$

A packet is the smallest unit of work effort consuming both time and resources that the project manager can schedule and control.

C$.$

Each activity in the WBS must have an$$ "owner" who is responsible for doing the work.

D$.$

WBS should not include a task representing planning of the project that is being planned.