Which of the Following Statements Refer to Expert Power

Which of the following statements refer to expert power?

A) It is the capacity to influence other people by virtue of formal authority, or the rights of office.
B) It is the capacity to influence other people because of specialized knowledge.
C) It is the capacity to offer something of value as a means of influencing other people.
D) It is the capacity to influence other people by personally identifying with them.
E) It is the capacity to punish or withhold positive outcomes as a means of influencing other people.