A seaplane is on the water in inland waters and risk of collision exists with an approaching power-driven vessel. Which statement correctly describes the seaplane's obligations under Inland Rule 18?

1. A. The seaplane is always the stand-on vessel because aircraft have priority over surface vessels.
2. ✓ The seaplane shall keep well clear in general, but when risk of collision exists she shall comply with Rules 4 through 19.Correct
3. C. The seaplane is treated as a vessel not under command and all other vessels must keep clear.
4. D. The seaplane has no obligations under the Inland Rules because it is an aircraft.