When osteoblast lay new bone from outside to inside in a osteon, the active formation area is called________________?

When osteoblast lay new bone from outside to inside in a osteon, the a

1.	When osteoblast lay new bone from outside to inside in a osteon, the active formation area is called________________?
A.	Haversion cone
B.	Filling cone
C.	Cutting cone
D.	Howships cone
Answer» C. Cutting cone