The two main functions of the retinal pigment epithelium are and a. structural support to maintain curvature of the retina; phagocytosis of shed outer segments b. structural support to maintain curvature of the retina; synthesis of rhodopsin c. phagocytosis of shed outer segments; synthesis of rhodopsin d. phagocytosis of shed outer segments; regeneration of the photopigments (retinal) e. synthesis of rhodopsin; regeneration of the photopigments (retinal)