The principal growth sites of the maxilla in a downward and forward direction include which of the following sutures?
1. Frontomaxillary.
2. Zygomaticomaxillary.
3. Pterygopalatine.
4. Median palatine.

(1) (2) (3)

(1) and (3)

(2) and (4)

(4) only.

All of the above.