Find All Values That Make the Rational Expression Undefined $$\frac { 4 x ^ { 2 } - 16 } { 6 x - 42 }$$

Multiple Choice

Find all values that make the rational expression undefined. If the rational expression is defined for all real numbers, so
state.
- $$\frac { 4 x ^ { 2 } - 16 } { 6 x - 42 }$$

A) $x = 2 , x = - 2$
B) $x = 7$
C) $x = 42$
D) Defined for all real numbers