The answer is (C): Three different light sources.
Explanation for each option:
(A) Three cameras: This is incorrect. Three-point lighting is a technique used in lighting, not related to the number of cameras.
(B) Three microphones: This is incorrect. Three-point lighting involves light sources, not microphones.
(C) Three different light sources: This is correct. Three-point lighting is a standard method used in visual media such as photography, video, and film. It involves using three different light sources: the key light, the fill light, and the back light, to create a well-lit scene with depth and dimension.
(D) Three directors: This is incorrect. Three-point lighting is not related to the number of directors involved in a production.
Summary: Three-point lighting involves the use of three different light sources to illuminate a subject effectively.