If the endpoints of a diameter of a circle are $(1, 2)$ and $(3, 4)$,then its equation is:
- A$x^2 + y^2 - 4x - 6y + 11 = 0$
- B$x^2 + y^2 - 4x - 6y - 11 = 0$
- C$x^2 + y^2 + 4x + 6y + 11 = 0$
- DNone of these
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