What should be done after every sounding?

Correct Answer: Option C — Wipe the line with a rag and spray with WD-40

Wiping the sounding tape with a rag and applying a light coat of WD-40 prevents corrosion and ensures the tape remains supple and easy to read. This maintenance step is critical for preserving the accuracy of the sounding equipment and preventing the buildup of debris that could obscure measurement markings.