Solve the Formula for the Specified Variable $\frac { 1 } { a } + \frac { 1 } { b } = \frac { 1 } { c } \quad$

Multiple Choice

Solve the formula for the specified variable.
- $\frac { 1 } { a } + \frac { 1 } { b } = \frac { 1 } { c } \quad$ for $c$

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