The following are true about the ABO and rhesus (Rh) system:
a. a person of group O is a universal donor
b. a person who is group AB has anti-A and anti-B antibodies
c. the presence of the D antigen means that the subject is Rh positive
d. rhesus antibodies occur naturally
a. a person of group O is a universal donor
b. a person who is group AB has anti-A and anti-B antibodies
c. the presence of the D antigen means that the subject is Rh positive
d. rhesus antibodies occur naturally