In this scenario, you have a red-coated cow (RR) and a white-coated bull (WW). Since the alleles are codominant, when these two are crossed, the offspring will inherit one allele from each parent.
The possible genotype of the offspring will be RW (one red allele and one white allele). In codominance, both alleles are expressed, resulting in a phenotype that shows both traits.
Therefore, the expected phenotypes of the offspring will be:
Red and white coat.
So the correct response is: Red and white coat.