Under RIPA Rule 12, when two sailing vessels have the wind on the SAME side, which vessel is required to keep clear?

1. The vessel which is to leeward (sotavento) must keep out of the way
2. The vessel which is to windward (barlovento) shall keep out of the way of the vessel which is to leeward (sotavento)
3. The vessel with the smaller mainsail must give way
4. Both vessels must tack immediately away from each other