If a male fly hemizygous for the recessive x-linked white mutation (w) is mated to a female fly heterozygous for white, and the phenotypically white f1 are intercrossed, which will be true:
a. half of both the f2 males and females are red
b. all of the f2 are red all of the f2 males are red, all of the f2 females are white
c. all of the f2 are white
d. all of the f2 males are white, all of the f2 females are red