The _____ also known as the _____ muscle is located at the b…

The _____ also known as the _____ muscle is located at the base of the mandible and inserts into the skin of the lower lip.  Furthermore, this muscle pulls the lower lip downward and forward.For this answer use all applicable names for this muscle, scientific and colloquial name(s).   a. depressor labii inferioris   b. risorius   c. false smile   d. quadratus