Solve the Equation in the Real Number System $$3 x ^ { 3 } - x ^ { 2 } + 3 x - 1 = 0$$

Multiple Choice

Solve the equation in the real number system.
- $$3 x ^ { 3 } - x ^ { 2 } + 3 x - 1 = 0$$

A) $\left\{ \frac { 1 } { 3 } \right\}$
В) $\left\{ - 3 , - \frac { 1 } { 3 } , - 1 \right\}$
C) $\left\{ \frac { 1 } { 3 } , - 1 \right\}$
D) $\left\{ - 3 , \frac { 1 } { 3 } , - 1 \right\}$