Which snapping option must be turned on to snap a road to the border of a land parcel?

Edge snapping is the correct choice because it specifically allows features to snap to the edges of other features. In this context, if you want to ensure that a road aligns precisely with the border of a land parcel, enabling edge snapping ensures that the road will connect to the boundary line of the parcel. This is particularly useful when working with vector data in a GIS environment, ensuring accurate spatial relationships between features.

Point snapping typically allows features to snap to specific points, such as vertices or control points, which wouldn’t provide the necessary alignment to the edge of the land parcel. End snapping focuses on snapping objects to the endpoints of other features, which may not be relevant if the intention is to align the entirety of the road with the border. Vertex snapping, on the other hand, is concerned with snapping to the vertices of features, which again would not facilitate snapping along the smooth edge necessary for road and parcel alignment.