If $f(x) = \begin{cases} 3ax - 2b, & x > 1 \\ ax + b + 1, & x < 1 \end{cases}$ and $\lim_{x \rightarrow 1} f(x)$ exists,then the relation between $a$ and $b$ is

  • A
    $3a - 2b = 1$
  • B
    $2a - 3b = 1$
  • C
    $2a + 3b = 1$
  • D
    $2a + 3b = -1$

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