. . . . . . $A$ . . . . . . grouping is based on the presence or absence of . . . . . . $B$ . . . . . . surface antigen on the $RBC$:

  • A
    $ABO$,Three
  • B
    $Rh$,Two
  • C
    $ABO$,Two
  • D
    $Rh$,One

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