The correct answer is Federal unity is important.
In his farewell address, Washington warned American citizens to avoid certain actions. One of the most important ones was the idea of avoiding permanent foreign alliances. He had no problem with America trading with other countries, however he felt that permanent military and economic alliances would result in America being dragged into foreign conflicts. This shows why statements 1 and 4 are incorrect.
Another warning Washington gave American citizens was to avoid creating political factions (aka political parties). He felt that political parties caused people to abandon their logic and that emotions would take over thei reasoning skills. This shows why statement 2 is incorrect.
Ultimately, Washington felt that the success of this young nation would depend strongly on staying unified.