Bightness constancy refers to the fact that: a. light waves reflected by an object remain constant despite changes in illumination levels.
b. one of the depth cues involves perceiving dimmer objects as being farther away.
c. the frequency of light waves has a fixed relationship to the brightness of the light.
d. the perceived whiteness of an object has a constant relation to its lightness.
e. objects are perceived to have consistent lightness even if the amount of light they reflect changes.