When a mandibular second molar that has tipped mesially following extraction the adjacent first is uprighted by fixed orthodontic therapy (e.g. fixed appliance on 47, 45, 44 and 43) the following tooth movements usually occur:
1. extrusion of the second molar.
2. lingual tipping of the second molar.
3. intrusion of the anchor unit.
4. buccal tipping of the anchor unit.

(1) and (3)

All of the above

(1) (2) (3)

4 only

(2) and (4)