Final answer:
A Fan Rib is an ornamental vaulting rib that produces a fan-like pattern and is neither springing from a pier nor a ridge rib. It became popular during the fifteenth century in the Perpendicular or International Gothic architectural periods.
Step-by-step explanation:
Among the choices given, an ornamental vaulting rib that is neither a rib springing from a pier nor a ridge rib is most accurately described as a Fan Rib (D). Fan vaulting is characterized by decorative half-conoid shapes that extend from the tops of the columnar ribs, creating an impression of a fan.
This type of vaulting became particularly popular during the Perpendicular or International Gothic period, which emerged by the fifteenth century.A Fan Rib is an ornamental vaulting rib that produces a fan-like pattern and is neither springing from a pier nor a ridge rib. It became popular during the fifteenth century in the Perpendicular or International Gothic architectural periods.