The locus of the equation \[{{x}^{2}}+{{y}^{2}}+{{z}^{2}}+1=0\]is

1.	The locus of the equation \[{{x}^{2}}+{{y}^{2}}+{{z}^{2}}+1=0\]is
A.	An empty set
B.	A sphere
C.	A degenerate set
D.	A pair of planes
Answer» B. A sphere

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The locus of the equation \[{{x}^{2}}+{{y}^{2}}+{{z}^{2}}+1=0\]is

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