What innovative feature appeared in the east end of Saint-Étienne at Vignory?

A) An apse and a triumphal arch
B) A double transept and a chancel arch
C) Ocular semidomes
D) An ambulatory and three radiating chapels

Ambulatory

A covered walkway, outdoors (as in a church cloister) or indoors; especially the passageway around the apse and the choir of a church. In Buddhist architecture, the passageway leading around the stupa in a chaitya hall.

Saint-Étienne

A city in France known for its historical and cultural significance, often associated with architectural landmarks and historical sites.

Radiating Chapels

In medieval churches, chapels for the display of relics that opened directly onto the ambulatory and the transept.