What is a primary function of fiber-optic cables?
a. magnifying distant images
b. cutting through metals
c. carrying signals at high speeds
d. performing high-precision surgery

Carrying signals at high speeds

Fiber optics (optical fibers) are large, thin strands of extremely pure glass about the breadth of a human hair. They are organized in packages described as optical cables which are utilized to transfer light signals over long distances. Moreover, Fiber optic Internet transfers data faster than  any ordinary cable.