If the function $f(x)$ defined by $f(x) = \begin{cases} ax + 1 & \text{if } x \leq 3 \\ bx + 3 & \text{if } x > 3 \end{cases}$ is continuous at $x = 3$, then $(a - b) = ..........$

  • A
    $\frac{2}{3}$
  • B
    $\frac{3}{2}$
  • C
    $2$
  • D
    $3$

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