What Is the Key Difference Between Incomplete Dominance and Codominance

What is the key difference between incomplete dominance and codominance?

A) With incomplete dominance, the recessive allele cannot be detected; in codominance, the expression of the recessive allele is apparent.
B) With codominance, it is possible to detect the expression of a recessive allele; in incomplete dominance, both alleles contribute equally to the phenotype.
C) With incomplete dominance, it is possible to detect the expression of the dominant allele; in codominance, both alleles contribute equally to the phenotype.
D) With incomplete dominance, it is possible to detect the expression of a recessive allele; in codominance, both alleles contribute equally to the phenotype.