What Is the Purpose of the Acrylic Resin Surgical Guide

What is the purpose of the acrylic resin surgical guide (stent) ?

A) The stent is the drill used to cut into the bone.
B) Predetermined holes in the stent allow the surgeon to cut a hole into bone for the implant at the correct angulation.
C) The stent holds the patient's mouth open during implant placement surgery.
D) The stent is placed near the back of the throat to prevent the patient from swallowing any foreign objects during surgery.