What is a PDU? Which response is more complete? A. PDUs are the measuring unit used to quantify your professional development. B. It serves to validate your participation and continued proficiency in its principles and practices. C. PDUs are Professional Development Units issued by the Project Management Institute. They can be earned by completing educational training or learning opportunities, which serve to validate your participation and continued proficiency in its principles and practices D. 1 PDU = 1 hour of learning/activity