Match the followingGroup of answer choicesTwisted pair cable - twisting of wiresCoaxial cableOptical cablestep indexgraded index

Sure, here are the matches:

1. Twisted pair cable - Twisting of wires: This is a type of wiring where two conductors are twisted together for the purposes of canceling out electromagnetic interference (EMI) from external sources.

2. Coaxial cable - This is a type of electrical cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield. It is used as a transmission line for radio frequency signals.

3. Optical cable - This can be divided into two types: step index and graded index.

   • Step index: In this type of fiber, the core is made up of a single uniform material and has a constant refractive index.

   • Graded index: In this type of fiber, the refractive index of the core decreases gradually from the center towards the cladding, allowing light rays to travel faster through the outer portions of the core than through the center.