The oral examination of the edentulous patient should include digital palpation because
1. the thickness of the mucosa can better be evaluated.
2. undercut areas may be hard to visualize.
3. spicules under the mucosa may be overlooked.
4. the arch form can be more accurately evaluated

(1) (2) (3)

(4) only

(2) and (4)

All of the above.

(1) and (3)