Why is shielding used for avionics cables and what routing practices minimize EMI?

Why is shielding used for avionics cables and what routing practices minimize EMI?

• A. Shielding reduces EMI; route data and power separately, avoid parallel runs, keep high current lines away, ground shield at one end to prevent loops.
• B. Shielding is used to prevent physical damage; ground shield at both ends to maximize current return.
• C. Shielding increases weight; thus kept away; ground shield at random.
• D. Shielding is optional; place shield near antennas; ground at both ends.

Answer: (A)