What is meant by depth perc0eption? Select one: a. The perception of nonexistent contours as if they were the edges of real objects b. The perception of the relative distance of objects c. The perceptual process that makes an object appear to maintain its normal shape regardless of the angle from which it is viewed d. The perceptual process that makes an object appear to remain the same size despite changes in the size of the image it casts on the retina