Lingual flange in the posterior region is determined by:
Lingual ﬂange in the anterior region is determined by genioglossus, in molar region by mylohyoid in posterior region it is determined by palatoglossus and superior constrictor.
Labial border is determined by buccinator and masseter.
Genioglossus
Mylohyoid
Superior constrictor
All of the above