The Project Manager for the development of a client's data center is working with her project team to develop the project's WBS$.$ She shows her team how to break down the Project Scope into WBS components but her team is having trouble understanding how far down the breakdown effort should go$.$ She plans to inform her team what the lowest level item in a WBS is$.$ What is the answer she will provide?Group of answer choicesA DeliverableA Leaf ObjectAn ActivityA Work Package