A pushing vessel and a vessel being pushed ahead are rigidly connected in a composite unit and are operating in restricted visibility. Which fog signal applies to this composite unit?

1. A. One prolonged blast followed by two short blasts, because the pushing vessel is engaged in towing
2. ✓ The signals prescribed for a power-driven vessel making way or stopped, because the composite unit is regarded as a power-driven vesselCorrect
3. C. One prolonged blast followed by three short blasts, because the pushed vessel must signal separately
4. D. Two separate signals: the towing vessel sounds one prolonged blast and the pushed vessel sounds one prolonged followed by three short blasts