The CR for an AP foot is.. Angled 10 degrees to the head of the 3rd metatarsal

The CR for an AP foot is:
a. Angled 5 degrees to the 3rd metatarsal.
b. Angled 10 degrees to the base of the 3rd metatarsal.
c. Angled 10 degrees to the head of the 3rd metatarsal.
d. Angled 20 degrees to the base of the 3rd metatarsal.