How does sexual differentiation of the brain differ between rodents and primates?

a. In rodents it depends on the level of testosterone. In primates it depends on the level of estradiol.

b. In rodents it depends on the level of estradiol. In primates it depends on the level of testosterone.

c. In rodents, testosterone must be aromatized to estradiol before it affects developing neurons.

d. In primates, testosterone must be aromatized to estradiol before it affects developing neurons.