Observe the following statements $A$: $f(x)=2x^3-9x^2+12x-3$ is increasing outside the interval $(1,2)$. $R$: $f'(x) < 0$ for $x \in (1,2)$. Then,which of the following is true?

  • A
    Both $A$ and $R$ are true,and $R$ is not the correct reason for $A$
  • B
    Both $A$ and $R$ are true,and $R$ is the correct reason for $A$
  • C
    $A$ is true but $R$ is false
  • D
    $A$ is false but $R$ is true

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