At what points on the curve \( x^{2}+y^{2}-2 x-4 y+1=0 \), the tangents are parallel to the y-ax...

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At what points on the curve \( x^{2}+y^{2}-2 x-4 y+1=0 \), the tangents are parallel to the y-axis?
(a) \( (3,2) \)
(b) \( (3,-2) \)
(c) \( (-3,2) \)
(d) \( (1,2) \)
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