Solve the Inequality $$4 x ^ { 2 } - 5 x \geq 9$$

Multiple Choice

Solve the inequality. Write the solution set in interval notation.
- $$4 x ^ { 2 } - 5 x \geq 9$$

A) $\left[ - 1 , \frac { 9 } { 4 } \right]$
B) $\left( - 1 , \frac { 9 } { 4 } \right)$
C) $( - \infty , - 1 ] \cup \left[ \frac { 9 } { 4 } , \infty \right)$
D) $( - \infty , - 1 ) \cup \left( \frac { 9 } { 4 } , \infty \right)$