Which of the following condition(s) increase(s) susceptibility to dental caries?
1. Vitamin K deficiency during tooth development.
2. Vitamin D deficiency during tooth development.
3. Hereditary fructose intolerance.
4. Hyposalivation.

(2) and (4)

(1) (2) (3)

(1) and (3)

(4) only

All of the above.