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The function $f(x) = x^3 - 3x$ is $.......$

• A
  increasing in $(0, \infty )$ and decreasing in $(- \infty , 0)$
• B
  decreasing in $(0, \infty )$ and increasing in $(- \infty , 0)$
• ✓
  increasing in $(- \infty , - 1) ∪ (1, \infty )$ and decreasing in $(-1, 1)$
• D
  decreasing in $(- \infty , -1) ∪ (1, \infty )$ and increasing in $(-1, 1)$