Mintzberg's Research on Managers Showed Which of the Following

Short Answer

Mintzberg's research on managers showed which of the following?
Managers prefer written media.
Managers work under varying degrees of pressure, sometimes being very busy, and sometimes much less busy.
Managers typically begin a task and then work on it until it is finished.
Managers have a preference for historical data rather than "live action."
None of these are true.