The correct answer is (c), twisted pair.
A twisted pair cable consists of two insulated copper wires twisted together. This type of cable is used for Ethernet networks and telephone lines. The twisting of the wires helps to reduce interference from other cables and electromagnetic fields.
A coaxial cable consists of a central conductor surrounded by a shield. The shield helps to protect the signal from interference. Coaxial cables are often used for cable television and high-speed Internet connections.
A fiber-optic cable consists of a thin strand of glass or plastic that carries light. Fiber-optic cables are very good at carrying signals over long distances without losing strength. They are often used for telecommunications and networking.
A Cat-6 cable is a type of twisted pair cable that is used for Ethernet networks. Cat-6 cables are capable of carrying data at speeds of up to 1 gigabit per second.