Simplify the Radical $\sqrt { 18 z t ^ { 11 } }$

Multiple Choice

Simplify the radical. Assume that all variables represent positive real numbers. $\sqrt { 18 z t ^ { 11 } }$

A) $9 t ^ { 5 } \sqrt { 2 z t }$
B) $3 z t ^ { 5 } \sqrt { 6 } t$
C) $3 t \sqrt { 2 z t ^ { 9 } }$
D) $3 t ^ { 5 } \sqrt { 2 z t }$