Which cable type provides noise protection using foil shielding?

The correct answer highlights a specific kind of cable that utilizes foil shielding to protect against noise, which is a critical feature in data transmission. Foil shielding is a technique employed primarily in shielded twisted pair cables, not in cables transmitting signals in a specific frequency range like 15 to 20 MHz.

Twisted pair cable is designed with pairs of wires twisted together to help reduce electromagnetic interference, and when it incorporates foil shielding, it further enhances protection against noise by providing a barrier that blocks unwanted interference from external sources. This shielding can be especially beneficial in environments where there are numerous electronic devices that might emit noise.

Fiber optic cable, on the other hand, transmits data as light signals and is immune to electromagnetic interference naturally, thus eliminating the need for foil or any other type of shielding for noise protection. Coaxial cable does include shielding, typically in the form of a metal braid, which protects against noise; however, foil shielding is a distinct feature more commonly associated with twisted pair designs.

Understanding these distinctions helps clarify why foil shielding is specifically associated with twisted pair cables rather than a frequency range or the other cable types mentioned.