Which of the following BEST identifies the correct number of layers in a WBS?

A WBS should be decomposed to a level where each work package can be realistically and efficiently managed, estimated, scheduled, and controlled. This means breaking down work into discrete, manageable activities that can be assigned and tracked effectively by the project team, ensuring the level of detail supports effective project governance.

While overall project complexity influences the total scope, the specific number of WBS layers is determined by the manageability of the lowest-level work packages, not just the complexity itself.

Decomposing until tasks are 'small, specific tasks' is an insufficient criterion; the primary goal is manageability for planning and control, which might require varying levels of detail beyond just smallness.

WBS decomposition levels are not uniform across all objectives or project components; different branches of a WBS may require varying levels of detail based on their unique characteristics, risks, and complexity.