Which genotype illustrates codominance of alleles that control blood type in humans?

The genotype that illustrates codominance of alleles that control blood type in humans is IAIB
A genotype is the genetic make up of an organisms, it is a set of genes in our DNA which is responsible for a particular trait. The phenotype on the other hand is the physical expression, or characteristics, of that trait. Codominance is a form of dominance where the alleles of a pair in a heterozygote are fully expressed. This results in offspring with a phenotype that is nether dominant nor recessive. 

Cwould most likely affect a cow's offspring.hope this 's and give me brainiest!