If the line $lx + my = 1$ is a normal to the hyperbola $\frac{x^2}{a^2} - \frac{y^2}{b^2} = 1$,then $\frac{a^2}{l^2} - \frac{b^2}{m^2}$ is equal to
- A$a^2 - b^2$
- B$a^2 + b^2$
- C$(a^2 + b^2)^2$
- D$(a^2 - b^2)^2$
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