How does Nanni de Banco's The Four Crowned Martyrs at Orsanmichele demonstrate a revival of classical artistic tradition?

Question

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Nanni de Banco's The Four Crowned Martyrs at Orsanmichele demonstrates a revival of classical artistic tradition through the following features: 
A) The figures are individualized with highly realistic details like Roman portraiture, which is a characteristic of classical art. 
B) The figures extend into the space outside of the niche, a technique known as "contrapposto," which was used in classical art to create a sense of naturalism and movement. 
C) Their togas reveal the solid mass of the figures' bodies, which is a technique used in classical art to create a sense of weight and gravity. Therefore, all of the above features demonstrate a revival of classical artistic tradition in the artwork.

How Does Nanni De Banco's the Four Crowned Martyrs at Orsanmichele