People who have the o blood type possess ) an enzyme that adds an n-acetylgalactosamine to the end of the oligosaccharide chain on rbc membrane glycolipids2) an enzyme that adds a galactose to the end of the oligosaccharide chain on rbc membrane glycolipids3) an enzyme that adds phospholipids to the end of the oligosaccharide chain on rbc membrane glycolipids4) no enzymes capable of attaching galactose or n-acetylgalactosamine to the end of the oligosaccharide chain on rbc membrane glycolipidsa. 2b. 3c. 4d. 1 and 2e. 1