Mark the correct alternatives in each of the following: The equation \( x^{2}+y^{2}+2 x-4 y+5=0 ...

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Mark the correct alternatives in each of the following:
The equation \( x^{2}+y^{2}+2 x-4 y+5=0 \) represents
(A) a point
(B) a pair of straight lines
(C) a circle of non-zero radius
(D) none of these
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