For real values of ( x ), the range of the function ( f ( x ) = \frac { 2 x - 3 } { 2 x ^ { 2 } + 4 x - 6 } ) is

( \left( - \infty , \frac { 1 } { 8 } \right] \cup [ 1 , \infty ) )

( \left( - \infty , \frac { 1 } { 8 } \right] \cup \left[ \frac { 1 } { 2 } , \infty \right) )

( \left( - \infty , \frac { 1 } { 4 } \right] \cup \left[ \frac { 1 } { 2 } , \infty \right) )

( \left( - \infty , \frac { 1 } { 4 } \right] \cup [ 1 , \infty ) )