Solve the Equation in the Real Number System $2 x ^ { 3 } - x ^ { 2 } - 12 x + 6 = 0$

Multiple Choice

Solve the equation in the real number system.
- $2 x ^ { 3 } - x ^ { 2 } - 12 x + 6 = 0$

A) $\left\{ - \frac { 1 } { 2 } , \sqrt { 6 } , - \sqrt { 6 } \right\}$
B) $\{ - 2 , \sqrt { 6 } , - \sqrt { 6 } \}$
C) $\{ 2 , \sqrt { 6 } , - \sqrt { 6 } \}$
D) $\left\{ \frac { 1 } { 2 } , \sqrt { 6 } , - \sqrt { 6 } \right\}$