PDM includes four types of dependencies or precedence relationships:（）.The completion ofthe successor activity depends upon the initiation of the predecessor activity.

The process of（）schedule activity durations uses information on schedule activityscope of work, required resource types, estimated resource quantities, and resource calendarswith resource availabilities.

The（）provides the project manager with the authority to apply organizational resources to project activities.

The（）Process Group consists of the processes used to complete the work defined in the project management plan to accomplish the project's requirements.