If the functions $f(x) = \frac{x^3}{3} + 2bx + \frac{ax^2}{2}$ and $g(x) = \frac{x^3}{3} + ax + bx^2$,where $a \neq 2b$,have a common extreme point,then $a + 2b + 7$ is equal to

  • A
    $4$
  • B
    $\frac{3}{2}$
  • C
    $3$
  • D
    $6$

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