Observe the following: For the circle $\mathrm{S}\equiv(x-2)^{2}+(y+1)^{2}=1$ List I List II a) a tangent is 1) $3x+4y-2=0$ b) a diameter is 2) $x = 0$ c) a line perpendicular to a tangent is 3) $y = 0$ d) a chord is 4) $y+\dfrac12 = 0$

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