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The following reactions are obtained on ABO testing of a patient's blood sample. What is the most likely ABO group?
Anti-A: 3+
Anti-B: NEG
Anti-A1: NEG
A1 cells: 2+
A2 cells: NEG
B cells: 4+
O cells: Neg
a. Ax
b. A1
c. A2 with anti-A1
d. A2B with anti-A2
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