Which of the Following Is Not True About Blood Types

Which of the following is not true about blood types?

A) I^A represents antigen A on red blood cells.
B) One person with AB blood has two different antigens on his red blood cells.
C) The allele representing blood type O is recessive.
D) This is an example of a multiple allele trait and an individual can have up to three different alleles.
E) Blood types exhibit codominance and are also an example of a multiple allele trait.