A Physician-Hospital Organization (PHO) May Be Classified as an Open

A physician-hospital organization (PHO) may be classified as an open PHO or a closed PHO. With respect to a closed PHO, it is correct to say that

A) should assume that all services requiring preauthorization have been preauthorized
B) the specialists in the PHO are typically compensated on a capitation basis
C) it typically limits the number of specialists by type of specialty
D) it is available to a hospital's entire eligible medical staff
E) physician membership in the PHO is limited to PCPs