Paul, the marketing manager of a food company, created a diagram of nodes to represent the marketing process for a new product of the company. Each node represented an activity in the marketing process, and an arc joined each node. He used this diagram to demonstrate the objectives of the marketing process. In the context of the language of the Program Evaluation and Review Technique (PERT) and the Critical Path Method (CPM), the diagram used by Paul is known as a network O flowchart Gantt chart O Smith chart control chart