Which of the following is correct regarding individuals who are blood type AB?
◦ They express B-transferase that adds N-acetylgalactosamine to the H antigen.
◦ They carry both the anti-A and anti-B antibodies.
◦ They do not carry the A or B antigen.
◦ They are the universal recipients.
◦ Their blood cells clump when they receive blood from an individual with the genotype IAi.