Which tooth of the mandibular anterior teeth that touch the lingual surface of the maxillary anterior teeth in normal centric relation.. Cuspid - Canine

Which tooth of the mandibular anterior teeth that touch the lingual surface of the maxillary anterior teeth in normal centric relation?
1. Central incisor.
2. Lateral incisor.
3. Cuspid (Canine).***
4. None.