$86.$ How does Abilify work in the brain?

a$)$ It blocks D$2$ receptors from being activated by dopamine.

b$)$ It enhances the activity of dopamine at the D$4$ subtype of dopamine receptors.

c$)$ It stabilizes the activity of the D$2$ subtype of dopamine receptors.

d$)$ It blocks D$4$ subtype of dopamine receptors.