2. Which statement is not true of muscle locations and functions?
a. The deltoid is the shoulder muscle that abducts the shoulder.
b. The quadriceps femoris group is on the front of the thigh and extends the knee.
c. The triceps brachii extends the elbow, its antagonist is the biceps brachii.
d. The rectus abdominis is in the front of the abdomen and extends the trunk