Identify the Horizontal Asymptote Of $g ( x ) = \left( \frac { 7 } { 8 } \right) ^ { x } + 7$

Identify the horizontal asymptote of $g ( x ) = \left( \frac { 7 } { 8 } \right) ^ { x } + 7$ .

A) $y = 7 \frac { 7 } { 8 }$
B) x -axis
C) y=-7
D) y=7
E) $y = - \frac { 7 } { 8 }$