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 tools

AOA (Activity-on-Arrow) is a network diagramming method where activities are represented by arrows, and nodes represent events or milestones, which is the opposite of activities in boxes.

WBS (Work Breakdown Structure) is a hierarchical decomposition of project deliverables and work, not a network diagram that shows activity dependencies.

ADM (Arrow Diagramming Method) is another name for AOA, where activities are placed on arrows, not in boxes, contradicting the question's description.

The Precedence Diagramming Method (PDM), also known as Activity-on-Node (AON), represents project activities as nodes (boxes or rectangles) and illustrates their dependencies using arrows or lines connecting these nodes, directly matching the description.