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x^2+y^2=20
the only posiiblity being 16 +4 for x and y to take integer values
For x = 4 and y = 2 possiblities being:
(4, 2), ( -4, 2), ( -4, -2) and ( 4, -2) = 4
For x = 2 and y = 4 possiblities being :
(2, 4), ( -2, 4), ( -2, -4) and ( 2, -4) = 4
Hence IMO B
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OA should consider that Points (0,20), (0,-20),(20,0), and (-20, 0) also have values of x and y as integers
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BlueDefender
OA should consider that Points (0,20), (0,-20),(20,0), and (-20, 0) also have values of x and y as integers

These coordinates would not satisfy the equation. Remember 20 is r^2 and not r. all these points will be outside the circle
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