What are the feed rate and depth of cut tooth of metal milling processing? ( )
选项：

A:Depth of Cut: This is how deep the surface of the material is under the tool.
B:Feed rate (F): This is the speed at which the material is fed into the cutter. Typical values are from 20 mm/min to 10,000 mm/min.
C:Depth of Cut: This is how deep the tool is under the surface of the material being cut.
D:Feed rate (F): This is the speed at which the material is moved away from the cutter. Typical values are from 20 mm/min to 10,000 mm/min.