Solve the Equation by Making an Appropriate Substitution $2 x ^ { 1 / 2 } - 5 x ^ { 1 / 4 } - 12 = 0$

Multiple Choice

Solve the equation by making an appropriate substitution.
- $2 x ^ { 1 / 2 } - 5 x ^ { 1 / 4 } - 12 = 0$

A) $\{ 256 \}$
B) $\left\{ 256 , \frac { 81 } { 16 } \right\}$
C) $\{ - 4 , - 3 \}$
D) $\left\{ 4 , - \frac { 3 } { 2 } \right\}$