Simplify Express Final Results Using Positive Exponents Only $\left( 5 y x ^ { \frac { 1 } { 4 } } \right) ^ { 4 }$

Multiple Choice

Simplify. Express final results using positive exponents only. $\left( 5 y x ^ { \frac { 1 } { 4 } } \right) ^ { 4 }$

A) $625 x y ^ { 4 }$
B) $625 x y ^ { \frac { 1 } { 4 } }$
C) $625 y x ^ { 4 }$
D) $5 x y ^ { 4 }$