Which one of the following statements is true as defined in endodontics?

Underextension refers to the vertical extent of the filling material regardless of its completeness of obturation

All of the above.

Overextension refers to the extrusion of filling material through an accessory canal.

Underfilling refers to the complete filling of the canal space, but leaving voids in the pulp chamber for possible recontamination or infection.

Overfilling refers to the incomplete filling of the canal system with a surplus of material extruding beyond the apical foramen.