It is said that to be successful in project management, a project manager must have a number of key competencies, skills, and abilities. Of the following, ______ is the project management competency that relates to a PM's ability to perceive all of the relationships and interconnections in the project content, project team, project organization, and the organization's environment.

A. proactive

B. of high personal integrity

C. tolerant under stress

D. a systems thinker