Which of the following statements accurately defines deltoid?
a) Deep postural back muscles that run along the vertebral column
b) An extension of the sarcolemma that dives into the muscle fiber and surrounds myofibrils
c) Triangular, superficial chest muscle
d) Triangular-shaped muscle over the shoulder, adducts the humerus
e) Triangular-shaped muscle over the shoulder, abducts the humerus