Which of the following can be mistaken on a radiograph for a chronic alveolar abscess?
1. Mental foramen.
2. Periapical cemento-osseous dysplasia.
3. Posterior palatine foramen.
4. Nasopalatine foramen.

All of the above

(1) (2) (3)

(1) and (3)

(2) and (4)

(4) only