The insect head is essentially a capsule which encloses the brain and bears the usually external (ectognathous) mouthparts, the eyes and a pair of sensory antennae. The mouth part comprise basic sections as:

Question

Accepted Answer

All of these. The insect head capsule indeed bears the labrum (upper lip), hypopharynx (tongue-like structure), mandibles (jaws), maxillae, and labium (lower lip). All listed options are correct components of the mouthparts.