Perform $\frac { \sqrt [ 3 ] { 9 } } { \sqrt [ 4 ] { 9 } }$

Multiple Choice

Perform. $\frac { \sqrt [ 3 ] { 9 } } { \sqrt [ 4 ] { 9 } }$ Express answers in simplest radical form.

A) $\frac { 1 } { \sqrt [ 12 ] { 9 } }$
B) $\sqrt [ 12 ] { 81 }$
C) $\sqrt [ 7 ] { 9 }$
D) $\sqrt [ 12 ] { 9 }$