If the line $x + my + am^2 = 0$ is tangent to the parabola $y^2 = 4ax$,find the point of contact.
- A$(am^2, -2am)$
- B$(\frac{a}{m^2}, \frac{-2a}{m})$
- C$(-am^2, -2am)$
- DThe line is not a tangent.
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