A vessel of 10 meters in length is engaged in underwater operations and is restricted in her ability to maneuver. She is NOT engaged in diving operations. Which statement regarding her obligation to display Rule 27 lights and shapes is correct?

1. ✓ She is not required to exhibit the lights or shapes prescribed in Rule 27Correct
2. B. She must exhibit the full RAM lights and shapes as prescribed in Rule 27(b)
3. C. She must exhibit only the Code flag 'A' replica in lieu of all other signals
4. D. She must exhibit two all-round red lights in a vertical line as a minimum