If the points $(a, 0)$,$(0, b)$,and $(1, 1)$ are collinear,then:
- A$\frac{1}{a^2} + \frac{1}{b^2} = 1$
- B$\frac{1}{a^2} - \frac{1}{b^2} = 1$
- C$\frac{1}{a} + \frac{1}{b} = 1$
- D$\frac{1}{a} - \frac{1}{b} = 1$
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