The correct answer is Twisted Pair cables. The Category designations such as CAT4 and CAT6 are classifications for copper twisted pair cabling families and they describe performance levels for unshielded and shielded variants used in Ethernet networks.

Category numbers define electrical performance and maximum frequency for the twisted pair family and they are the standard way to identify copper Ethernet cable grades from early low speed types up to modern high speed types.

Fiber optic cables are a different transmission medium that use glass or plastic fibers to carry light and they do not use the CAT numbering scheme for copper twisted pair cables.

Shielded twisted pair cabling is a subtype of the twisted pair family and it is not the overall family name asked for. Shielded variants may also receive category ratings but the family that includes CAT4 and CAT6 is the broader twisted pair family.

Coaxial cables use a single center conductor with a surrounding shield and they follow different standards and naming conventions rather than the CAT classification used for twisted pair copper cabling.

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