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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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