The function $f(x) = \frac{2x^2 + 7}{x^3 + 3x^2 - x - 3}$ is discontinuous for
- A$x = 1$ only
- B$x = 1$ and $x = -1$ only
- C$x = 1, x = -1, x = -3$ only
- D$x = 1, x = -1, x = -3$ and other values of $x$
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