$A$ person with an unknown blood group under the $ABO$ system has suffered significant blood loss in an accident and requires an immediate blood transfusion. His friend,who has a valid certificate of his own blood type,offers to donate blood without delay. What would be the blood group of the donor friend?

  • A
    Type $B$
  • B
    Type $AB$
  • C
    Type $O$
  • D
    Type $A$

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