The nurse is teaching family members of a client with hepatitis A virus (HAV). Family members were exposed to the client and, therefore, should receive immunoglobulin. The nurse should tell the family members that immunoglobulin （）.

A．prevents hepatitis infection in all people.

B．provides immunity for life.

C．must be administered within 2 weeks of exposure.

D．should be administered even if the person has anti-HAV antibodies.