Fact 1: Telephones are used for communication by two people by transmitting sound.

Fact 2: Telephone conversations and data are transmitted through optical fibers.

Given the two facts above, answer the question "What through phones is transmitted through optical fibers?" with the following options: 
- photons
 - medicine
 - An object is seen
 - pictures
 - Communication
 - Electrical energy
 - electricity
 - telephone bills


 

     Communication    