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Choose the correct option from the given alternatives: The equation of the tangents of the circle `x^2+y^2=4`which are parallel to the line `x+2y+3=0`are

A

`x-2y=+-2`

B

`x+2y=+-2sqrt3`

C

`x+2y=+-2sqrt5`

D

`x-2y=+-2sqrt5`

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