A vessel engaged in fishing with purse seine gear is hampered by her fishing gear. She elects to display the optional purse seine signals. Which description correctly identifies those signals?

1. ✓ Two yellow lights in a vertical line, flashing alternately every second with equal light and occultation durationCorrect
2. B. Two yellow lights in a vertical line, both flashing simultaneously every two seconds
3. C. One yellow light over one white light in a vertical line, flashing alternately
4. D. Two yellow lights in a vertical line, displayed as fixed lights only