Simplify the Expression $\frac { 64 u ^ { 6 } } { 4 u ^ { 2 } }$

Multiple Choice

Simplify the expression $\frac { 64 u ^ { 6 } } { 4 u ^ { 2 } }$ . Assume that u is not zero.

A) $16 u ^ { 3 }$
B) $8 u ^ { 4 }$
C) $16 u ^ { 4 }$
D) $8 u ^ { 3 }$
E) $8 u ^ { 8 }$