Which of the following statements about formal groups is true?

Which of the following statements about formal groups is true?
A) The placements of organization members in such areas as marketing departments and personnel departments are examples of establishing formal groups.
B) Formal groups are a collection of individuals whose common work experiences result in the development of a system of interpersonal relations that extend beyond those established by management.
C) The coordination of and communication among the formal groups is the responsibility of employees commonly called "cotter pins."
D) Formal groups are divided into two general types: interest groups and command groups.
E) The formal relationships among group members is summarized using a sociogram.