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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