$A$ person with blood group $AB$ is considered a universal recipient because they have:

• A
  both $A$ and $B$ antigens on $RBC$s but no antibodies in the plasma
• B
  both $A$ and $B$ antibodies in the plasma
• C
  no antigen on $RBC$s and no antibody in the plasma
• D
  both $A$ and $B$ antigens in the plasma but no antibodies