What do those with the AB blood type have? A. an enzyme that adds an N-acetylgalactosamine to the end of the oligosaccharide chain on RBC membrane glycolipids B. an enzyme that adds phospholipids to the end of the oligosaccharide chain on RBC membrane glycolipids C. no enzymes capable of attaching galactose or N-acetylgalactosamine to the end of the oligosaccharide chain on RBC membrane glycolipids D. an enzyme that removes a galactose to the end of the oligosaccharide chain on RBC membrane glycolipids