T6D03:Which of the following is a reason to use shielded wire?
Direct answer summary (2026-2030 NCVEC pool)
The official correct answer for T6D03 is To prevent coupling of unwanted signals to or from the wire.
The key fact is To prevent coupling of unwanted signals to or from the wire. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.