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If the line x cos theta + y sin theta =...

If the line ` x cos theta + y sin theta = 2 ` is the equation of a transverse common tangent to the circles ` x^(2) + y^(2) = 4 and x^(2) + y^(2) - 6 sqrt(3) x - 6 y + 20 = 0 `, then the value of `theta` is

A

`5 pi//6`

B

` 2 pi//3`

C

`pi//3`

D

`pi//6`

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The correct Answer is:
D
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