Under the Inland Navigation Rules, a vessel of 100 meters or more in length at anchor at night has which obligation regarding deck illumination?

1. A. She may use working lights to illuminate her decks at the master's discretion
2. ✓ She shall use the available working or equivalent lights to illuminate her decksCorrect
3. C. She is prohibited from using working lights so as not to impair the visibility of her anchor lights
4. D. She shall exhibit an additional all-round white light at the bow to illuminate the foredeck