A project manager is completing a project schedule network diagram using boxes to represent the project activities that are connected by lines to show their dependencies. Which of the following…

AOA (Activity on Arrow) uses arrows to represent activities and nodes to represent events or milestones, which is the inverse of the box-and-line structure described in the question.

WBS (Work Breakdown Structure) is a hierarchical decomposition of project deliverables and scope, not a network diagram depicting activity sequences and dependencies.

ADM (Arrow Diagramming Method) is synonymous with AOA and likewise uses arrows - not boxes - to represent activities, making it inconsistent with the described diagram.

PDM, also called Activity on Node (AON), places each project activity inside a node (box) and uses directional lines between nodes to represent dependency relationships such as finish-to-start or start-to-start - this is the standard modern scheduling network diagram technique used in project management tools.