b. He created many layers of support within the dome.
Explanation:
It was designed, designed and built by Filippo Brunelleschi, who began with this work the Italian and Florentine Renaissance in architecture. It is considered the most important construction built in Europe since Roman times, due to the fundamental relevance it has played for the subsequent development of architecture and the modern conception of construction.
The dome has a pointed shape and is formed by eight faces or ogival cloths, covered with red clay tile and bordered by eight nerves of white stone. The entire structure rests on an octagonal drum, perforated by eight holes for interior lighting. The nerves converge in an upper octagonal ring, crowned by a flashlight, an element that also collaborates in the entry of light. The interior consists of two caps or domes, one inside and one outside, built with brick arranged in the shape of a fishbone. They are connected to each other by means of an inner reticle formed by ribs, which supports the dome and helps in its stability. The gap between the two caps forms a space through which you ascend to the lantern. The exterior of the drum is lined with polychrome marbles and an incomplete balustrade that was only built on one of its faces. The inner face of the dome is decorated with frescoes and tempera paintings that represent the Last Judgment.