When making up a long, large coastwise tow, which of the following procedures is INCORRECT?

Correct Answer: Option C — Backup wires are left slack

Backup wires must be kept taut to ensure they immediately take the load if the primary towing hawser fails. Leaving them slack allows for a dangerous surge or 'snap' load, which can cause the tow to veer uncontrollably or lead to structural failure of the towing gear.