Which of the following landmarks are recognizable in periapical radiographs of the mandible?
1. External oblique ridge.
2. Coronoid process.
3. Mylohyoid ridge.
4. Mental foramen.
5. Incisive canal.

(1) (4) (5)

(1) (2) (3)

(1) (3) (4)

(3) (4) (5)

(2) (4) (5)