The equation of the tangent to the parabola $y^2 = 4x$ inclined at an angle of $\frac{\pi}{4}$ to the positive direction of the x-axis is ____

Question

$x + y - 4 = 0$

$x - y + 4 = 0$

$x - y - 1 = 0$

$x - y + 1 = 0$

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