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

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

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

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

All of the above.

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