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Let a variable line passing through the ...

Let a variable line passing through the centre of the circle `x^(2)+y^(2)-16x-4y=0` ,meet the positive co-ordinate axes at the points `A` and `B`. Then the minimum value of `OA+OB` ,where `O` is the origin,is equal to

A

18

B

20

C

24

D

12

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