In yeast,which of these is NOT a function of MAT genes?

A)controlling the expression of structural genes in a and α cells
B)MATa locus encoding a regulatory protein (a1)that affects only diploid cells
C)MATa locus encoding a regulatory protein (a1)that affects both haploid and diploid cells.
D)MATα allele encoding a regulatory protein (α2)that represses expression of a specific genes
E)None of the answer options are correct.