Solve the Three-Part Linear Inequality $$- \frac { 1 } { 3 } \leq \frac { 7 x - 1 } { 6 } < \frac { 1 } { 3 }$$

Multiple Choice

Solve the three-part linear inequality. Graph the solution set on a number line, and express the solution using interval notation.
- $$- \frac { 1 } { 3 } \leq \frac { 7 x - 1 } { 6 } < \frac { 1 } { 3 }$$

A) $\left[ - \frac { 5 } { 21 } , \frac { 1 } { 3 } \right]$

B) $\left( - \frac { 1 } { 7 } , \frac { 3 } { 7 } \right)$

C) $\left[ - \frac { 1 } { 7 } , \frac { 3 } { 7 } \right]$

D) $\left[ - \frac { 1 } { 7 } , \frac { 3 } { 7 } \right]$