$A$ person with an unknown $ABO$ blood group has suffered a major accident and requires immediate blood transfusion. $A$ friend offers to donate blood and has a valid certificate of their blood group. Which blood group must the friend have to ensure safe donation to any recipient?

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

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