A single gene possesses two codominant alleles, $A^E$ and $A^F$, together with one recessive allele, $A^G$. How many distinct genotypes and phenotypes can occur?
- A3 genotypes, 3 phenotypes
- B4 genotypes, 6 phenotypes
- C6 genotypes, 4 phenotypes
- D6 genotypes, 6 phenotypes