Which of the following is NOT a method for protecting copper wires from crosstalk?

a$.$ Twisting pairs of wires

b$.$ Adding shielding to the cable

c$.$ Separating the pairs of wires from each other

d$.$ Increasing the voltage used to send data over the wires

Increasing the voltage used to send data over the wires. Increasing the voltage does not protect

the wires from crosstalk, it increases the likelihood that crosstalk will occur.