Add the Rational Expressions $\frac { a - 4 } { a } - \frac { 4 } { a + 7 }$

Add the rational expressions. Be sure to express your answer in simplest form. $\frac { a - 4 } { a } - \frac { 4 } { a + 7 }$

A) $\frac { a ^ { 2 } - a + 28 } { a ( a + 7 ) }$
B) $\frac { a ^ { 2 } + a + 28 } { a ( a + 7 ) }$
C) $\frac { a ^ { 2 } - 2 a - 28 } { a ( a + 7 ) }$
D) $\frac { a ^ { 2 } - a - 28 } { a ( a + 7 ) }$

Correct Answer:

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