y=3x is tangent to the parabola 2y=ax^2+...

y=3x is tangent to the parabola `2y=ax^2+b`.
If b=18,then the point of contact is

A

(1,3)

B

(2,6)

C

(3,9)

D

(6,18)

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The correct Answer is:

D

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