Write the Expression in Lowest Terms $\frac { x + 7 } { 9 ( x + 7 ) }$

Write the expression in lowest terms. If the expression is already in lowest terms, so indicate. Assume that the denominator does not equal zero. $\frac { x + 7 } { 9 ( x + 7 ) }$

A) $\frac { x } { 7 }$
B) $\frac { 1 } { 9 }$
C) $\frac { 9 } { x + 7 }$
D) $\frac { x + 7 } { 9 }$
E) in lowest terms