Simplify the Expression $7 ^ { - 1 } + 5 ^ { - 1 }$

Multiple Choice

Simplify the expression. Write the result using positive exponents only.
- $7 ^ { - 1 } + 5 ^ { - 1 }$

A) $\frac { 1 } { 2 }$
B) $\frac { 35 } { 12 }$
C) $\frac { 12 } { 35 }$
D) 2