Fact 1: Wiring requires an electrical conductor.

Fact 2: Metals, such as copper wire, are good conductors for carrying electric current.

Given the two facts above, answer the question "What can be used in wiring as a conductor?" with the following options: 
- paper
 - energy
 - tube
 - copper
 - a prism
 - photons
 - leather
 - light


 

    copper     