In General,when Can a Corporate Officer Be Removed from Position

In general,when can a corporate officer be removed from position?

A) only pursuant to a violation of the officer's employment contract
B) only if shareholders vote unanimously to remove the officer
C) any time the board believes removal would be in the best interests of the corporation
D) only for violation of the "business judgment" rule
E) only if both the board of directors and the shareholders vote unanimously to remove the officer