 Definition of a Critical Path Method (CPM) Schedule:

CPM schedules are based on network diagrams that logically link activities, showing the sequence and dependencies between them.

These schedules identify the critical path, which is the longest path through the network, determining the project's shortest possible duration.

 Evaluation of Options:

Option A: Incorrect. While CPM schedules do include tasks and timelines, the defining feature is the logical interconnection of activities.

Option B: Incorrect. CPM schedules are not limited to "risky" work; they show all activities.

Option C: Incorrect. CPM schedules use network diagrams, not just graphical representations.

Option D: Correct. The network diagram is the key characteristic of CPM schedules.