What Is Meant by Codominance

What is meant by codominance?

A) The dominant allele in an X-linked trait is more likely to be expressed in males than in females.
B) Homozygotes have phenotypes in which the two forms of the allele are expressed separately.
C) The two alleles in a heterozygote each produce their own distinct phenotype equally.
D) Heterozygotes have a phenotype that is a mixture of the two alleles.
E) In homozygotes only the dominant form of the allele is expressed.