Answer: D keystone
Explanation:
The Keystone slightly protrudes from the wall at the point where the arch springs from- a pendentive is a curved triangle of vaulting formed by the intersection of a dome with its supporting arches , a Voussoir is a wedge-shaped or tapered stone used to construct an arch, and an impost ( the second closest to the definition ) is that part of an arch from which the arc swings upward.
Negative space is, quite simply, the space that surrounds an object in an image. Just as important as that object itself, negative space helps to define the boundaries of positive space and brings balance to a composition. I hope my answer has come to your help. God bless and have a nice day ahead!
