Solve the Equation by Making an Appropriate Substitution $$x ^ { 4 } - 30 x ^ { 2 } + 125 = 0$$

Multiple Choice

Solve the equation by making an appropriate substitution.
- $$x ^ { 4 } - 30 x ^ { 2 } + 125 = 0$$

A) $\{ - 5,5 , - i \sqrt { 5 } , i \sqrt { 5 } \}$
B) $\{ 5 , \sqrt { 5 } \}$
C) $\{ 25,5 \}$
D) $\{ - 5,5 , - \sqrt { 5 } , \sqrt { 5 } \}$