How was Leonardo’s portrait of Ginevra de’ Benci transported to the National Gallery of Art?

Leonardo da Vinci, Ginevra de’ Benci, ca. 1474/78 (Washington, DC, NGA)
Marjorie Och, Professor of Art History, UMW, ARTH 315 & 317: Art Museum Studies
How was Leonardo’s portrait of Ginevra de’ Benci transported to the National Gallery of Art?
Leonardo da Vinci, Ginevra de’ Benci, ca. 1474/78 (Washington, DC, NGA)