The dome of the Florence Cathedral (also known as the Cathedral of Santa Maria del Fiore) was designed by Filippo Brunelleschi and is one of the most remarkable architectural feats of the Renaissance. The innovative technique used for its construction was the double-shelled dome with an inner and outer layer.
The dome was designed to span an enormous 42 meters (137 feet) in diameter without the use of traditional scaffolding. The inner dome was constructed first, followed by the outer dome. This technique provided the necessary structural support and stability while also reducing the weight of the dome. The two shells were connected with a series of ribs that allowed the dome to distribute its weight evenly.
The other options, while they describe techniques used in Gothic architecture or other periods, are not relevant to the construction of the Florence Cathedral dome:
The correct answer is the double-shelled dome with an inner and outer layer.
Option 3: Double-shelled dome with an inner and outer layer