What are the points on the curve x^2+y^2...

What are the points on the curve `x^2+y^2-2x-3=0`, where the tangents are parallel to X-axis ?

A

(1,2) and (1, -2)

B

`(0, sqrt3)` and `(0, -sqrt3)`

C

(3, 0) and (-3, 0)

D

(2, 1) and (2, -1)

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The correct Answer is:

A

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