Options:
[a]. touch fibers.
[b]. process fibers.
[c]. hair fibers.
[d]. optical fibers.

Answer the following question given this paragraph: Total internal reflection allows the light to travel down the optical fiber and not pass through the sides of the tube. The light continuously reflects from the inside of the tube and eventually comes out the end. Optical fibers make interesting lamps but they are also used to transport telephone and television signals. Q: What kind of fibers are used to transport telephone and television signals? A:
Answer:
[d].