These indentations are called coffers.
a piece of music sung or played in the open air, typically by a man at night under the window of his lover.
In music, a serenade is a musical composition and/or performance delivered in honor. Serenades are typically calm, light pieces of music. The term comes from the Italian word serenata, which itself derives from the Latin word serenus.
What was specific about his painting technique was that he would always try to involve the viewer of the painting by drawing eyes and the positioning of his characters in such a way that it always seems as if they're maintaining eye contact with the audience. This was done using various perspectives and is kind of like an illusion, similarly to how the Mona Lisa is painted.
The answer is A, Villa Rotunda by Palladio.
