Fact 1: Wiring requires an electrical conductor.

Fact 2: Most electrical conductors, such as wires, are made of copper or gold.

Given the two facts above, answer the question "Wiring requires copper or what?" with the following options: 
- LEDs
 - energy
 - H20
 - fibers
 - SO2
 - motors
 - gold
 - tube


 

       gold  