Leonardo's style fully emerges in the cartoon, Virgin and Child with Saint Anne and the Infant Saint John. Which of the following describes this work?
a. The cartoon is ordered with pictorial logic reflecting the International Gothic style.
b. The cartoon is ordered with pictorial logic and visual unity.
c. The cartoon is ordered with the visual unity of the 15th century Flemish style.
d. The cartoon is ordered with pictorial logic of Piero della Francesca.