A pushing vessel and a vessel being pushed ahead are rigidly connected in a composite unit. Under Inland Rule 24, how must this combination be regarded and lighted?

1. A. As a vessel restricted in its ability to maneuver, exhibiting lights per Rule 27
2. ✓ As a power-driven vessel underway, exhibiting lights per Rule 23Correct
3. C. As a towing vessel, exhibiting two masthead lights in a vertical line and two towing lights
4. D. As a vessel not under command, exhibiting two all-round red lights in a vertical line