Find All Values That Make the Rational Expression Undefined $$\frac { 6 y - 4 } { y ^ { 2 } - 9 }$$

Multiple Choice

Find all values that make the rational expression undefined. If the rational expression is defined for all real numbers, so
state.
- $$\frac { 6 y - 4 } { y ^ { 2 } - 9 }$$

A) $y = \frac { 2 } { 3 }$
B) $y = 9$
C) $y = 3 , y = - 3$
D) $y = 3$