Simplify the Complex Fraction $\frac { 1 } { a } + \frac { 1 } { b } = \frac { 1 } { c }$

Multiple Choice

Simplify the complex fraction.
- $\frac { 1 } { a } + \frac { 1 } { b } = \frac { 1 } { c }$ for $c$

A) $c = \frac { a + b } { a b }$
B) $c = a + b$
C) $c = a b ( a + b )$
D) $c = \frac { a b } { a + b }$