Two power-driven vessels are crossing in open water so as to involve risk of collision. Vessel A sees Vessel B on her own starboard side (estribor). According to COLREGs Rule 15, which vessel is the give-way vessel and what must she do?

1. Vessel A is the give-way vessel; she must keep out of the way of Vessel B and, if circumstances permit, avoid crossing ahead of Vessel B
2. Vessel B is the give-way vessel; she must turn to port to pass behind Vessel A
3. Both vessels must maintain their course and speed until 50 meters apart
4. Vessel A must increase speed to pass rapidly across the bow of Vessel B