JEE Advance - Mathematics (1994 - No. 16)

Which one of the following curves cut the parabola $${y^2} = 4ax$$ at right angles?

$${x^2} + {y^2} = {a^2}$$

$$y = {e^{ - x/2a}}$$

$$y = ax$$

$${x^2} = 4ay$$

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