challenge: Where is the standard location for thoracostomy?
  
  A. The triangle of safety, bounded by the anterior border of the latissimus dorsi, the lateral border of the pectoralis major muscle, and a line superior to the horizontal level of the nipple
  B. The rectangle of safety, bounded by the anterior border of the pectoralis major muscle, the lateral border of the latissimus dorsi, and a line superior to the horizontal level of the xiphoid process
  C. The quadrilateral of danger, bounded by the posterior border of the trapezius, the medial border of the scapula, and a line inferior to the horizontal level of the nipple
  D. The triangle of safety, bounded by the anterior border of the trapezius, the lateral border of the pectoralis minor muscle, and a line inferior to the horizontal level of the clavicle
  Answer: 