The common tangent of x^(2)+y^(2)=4 and ...

The common tangent of `x^(2)+y^(2)=4 and 2x^(2)+y^(2)=2` is

A

x+y+4=0

B

x-y+7=0

C

2x+3y+8=0

D

None of these

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The correct Answer is:

D

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