Divide Assume All Variables Are Nonzero $$\left( 12 x ^ { 6 } \right) \div \left( 3 x ^ { 2 } \right)$$

Divide. Assume all variables are nonzero.
- $$\left( 12 x ^ { 6 } \right) \div \left( 3 x ^ { 2 } \right)$$

A) 16
B) $9 x ^ { 4 }$
C) $4 x ^ { 8 }$
D) $4 x ^ { 4 }$