A 60-year old patient requests the replacement of tooth 4.6, which was extracted many years ago. Tooth 1.6 has extruded 1.8mm into the space of the missing tooth. The three unit fixed bridge replacing the mandibular first molar should be fabricated

after restoring tooth 1.6 to a more normal plane of occlusion.

to the existing occlusion

after extracting tooth 1.6 and replacing it with a fixed partial denture.

after devitalizing and preparing tooth 1.6 for a cast crown.