Select the correct statement concerning the receptor subtypes involved in psychostimulant effects.
a. The locomotor-stimulating effects of cocaine involve the D5 receptor
b. D2 receptors are required for cocaine self-administration
c. Pimozide, a D2 receptor blocker, completely eliminates amphetamine-induced euphoria
d. D3 receptor antagonists block the effect of cocaine on self-stimulation of the brain
e. D1 receptor antagonists like ecopipam consistently block the subjective "high" due to cocaine