Correct Option: A

Barrel Vault is the simplest of the vaults and is the base design for many vaults that have a more intricate design. It consists of an ongoing series of semicircular arches. One is directly behind another, causing it to look like a half of a barrel. In some instances, it is described as resembling a tunnel. Groin Vault is created by two barrel vaults intersecting at right angles. The arches of groin vaults are round or point ed. It is also known as a cross vault. Rib Vault is a vault reinforced by masonry ribs is known as a rib vault. When this type of vault has two masonry ribs dividing it i nt o four sect i ons, i t is cal led a quadripartite rib vault. A vault divided by three masonry ribs that make six sections is called a sexpartite rib vault. Half cones that are fanshaped are know as Fan vaults. The cones meet in the center of the vault. This vault is considered to be a part of the rib vault family. Nubian vault is a type of curved surface forming a vaulted structure. The mudbrick structure was revived by Egyptian architect Hassan Fathy after rediscovering the technique in the Nubian village of Abual-Riche.