Identify the structures comprising the mediastinal margins.

A. Right innominate vein
B. SVC
C. Ascending aorta
D. Right atrium
E. Left innominate vein
F. Aortic knob
G. Aortopulmonary window
H. Left pulmonary artery
I. Left ventricle
J. Descending aorta
K. Diaphragm