What did the Rus do that led to the eventual influence of the Byzantine Empire on Russia?

The Rus established a strong trading relationship with Constantinople.
The Rus first invaded and then ruled over Constantinople as well as the Slavs.
The Rus were originally from the area ruled by the Byzantine Empire.
The Rus forced the entire population to convert to the church of the Byzantines.

Which of these was one of the most important aspects of washington's presidency a. he did not consider how his actions would affect later presidents b. he came to believe that political parties would be good for the country. c. he insisted that congress make specific rules about the duties of the president d. he did not take advantage of the opportunity to keep the power the country offered him.