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The tangent drawn at any point `P` to the parabola `y^(2)=4 a x` meets the directrix at the point `K,` then the angle which `K P` subtends at its focus is

A

`30^(circ)`

B

`45^(circ)`

C

`60^(circ)`

D

`90^(circ)`

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The correct Answer is:
D
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