When assessing the difficulty of removal of an impacted mandibular third molar, you should consider
1. depth in the alveolus.
2. periodontal ligament space.
3. root width.
4. angulation.
5. size of the pulp chamber.

(1) (2) (3) (4)

(1) (3) (5)

(2) (4) (5)

All of the above.