The center of the sphere which passes through the points (0, 0, 0), (1, 0, 0), (0, 1, 0) and (0, 0, 1) is
1
\(\left(-\frac{1}{2}, -\frac{1}{2}, -\frac{1}{2}\right)\)
2
\(\left(\frac{1}{3}, \frac{1}{3}, \frac{1}{3}\right)\)
3
\(\left(\frac{1}{2}, -\frac{1}{2}, -\frac{1}{2}\right)\)
4
\(\left(\frac{1}{2}, \frac{1}{2}, \frac{1}{2}\right)\)