$k$ is non-zero constant. If $k = \frac{a+b}{ab}$, then straight line $\frac{x}{a} + \frac{y}{b} = 1$ passes through the point :

Question

( A ) $(k, \frac{1}{k})$
( B ) $(\frac{1}{k}, \frac{1}{k})$
( C ) $(k, k)$
( D ) $(1, 1)$