Which of the Following Is One of DiIulio's Principles of Good

Which of the following is one of DiIulio's principles of good prison leadership?

A) Leaders following the "management by walking around" principle.
B) Leaders remaining in office long enough to modify the internal operations and external relations.
C) Issuing at least one disciplinary slip per officer per year.
D) Leaders following the "management by walking around" principle and remaining in office long enough to modify the internal operations and external relations.