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The correct answer is option 3: A, B, AB and O.
Blood groups are determined by the presence or absence of certain antigens on the surface of red blood cells. The ABO system classifies blood into four groups: A, B, AB, and O.
In this scenario, if one parent has blood group A and the other has blood group B, their children can inherit any combination of these blood types. A child can have blood group A if they inherit the A allele from either parent, blood group B if they inherit the B allele from either parent, and blood group AB if they inherit both the A and B alleles. Additionally, there is a possibility of the child inheriting blood group O if they inherit two O alleles, one from each parent.
Therefore, the children of this couple can have blood groups A, B, AB, and O.