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The number of such points (a+1,sqrt3a),...

The number of such points `(a+1,sqrt3a)`, where a is any integer, lying inside the region bounded by the circles `x^2 +y^2-2x-3=0` and `x^2+y^2-2x-15=0`, is

A

2

B

1

C

3

D

0

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