What form of rational function ( frac{px+q}{(x-a)(x-b)} ), a b represents?

• A. ( frac{A}{(x-a)} )
• B. ( frac{B}{(x-b)} )
• C. ( frac{A+B}{(x-a)(x-b)} )
• D. ( frac{A}{(x-a)} + frac{B}{(x-b)} )