Which of the following characteristics represent ‘Inheritance of blood groups’ in humans?(a) Dominance, (b) Co-dominance, (c) Multiple allele, (d) Incomplete dominance, (e) Polygenic inheritance

The $\text{ABO}$ blood group system in humans is an example of:Dominance: Alleles $I^A$ and $I^B$ are both dominant over allele $i$.Co-dominance: When both $I^A$ and $I^B$ are present, both are expressed (Blood group $\text{AB}$).Multiple alleles: The trait is controlled by three alleles ($I^A,I^B,i$) rather than just two.