What clinical evidence would support a diagnosis of acute dento-alveolar abscess?
1. A negative reaction to the electric vitality tester.
2. A positive reaction of short duration to cold.
3. A positive reaction to percussion.
4. Presence of a draining fistula.

(2) and (4)

(1) (2) (3)

(1) and (3)

All of the above.

(4) only