Under What Circumstances Does a DIRECT Interlocking Directorate Exist

Under what circumstances does a DIRECT interlocking directorate exist?

A) When both management and the board establish corporate strategic management.
B) When a corporation's employees serve on its board.
C) When one or more individuals on one board also serve on a board of a second firm.
D) Present when all board members are also employed by the corporation.
E) Occurs when two corporations have directors who serve on the board of a third firm.