The Charleston Bending Brace Is Preferred Over Other Braces Because

The Charleston bending brace is preferred over other braces because it:
1) is worn only 23 hours a day.
2) is worn for 8 to 10 hours at night.
3) is worn at night, when human growth hormone level is highest.
4) corrects any associated upper airway obstruction.

A) 1
B) 2
C) 2, 3
D) 1, 3, 4