Through a point on the middle of the chin toward the center of the image receptor describes the recommended point of entry of the central ray of the x-ray beam for which of the following occlusal radiographs?

a. Maxillary anterior topographical
b. Maxillary posterior topographical
c. Mandibular anterior topographical
d. Mandibular posterior topographical

c. The point of entry for directing the central ray of the x-ray beam when exposing a mandibular anterior topographical occlusal radiograph is through a point on the middle of the chin toward the center of the image receptor.