If for the function $f(x) = \frac{1}{4}x^2 + bx + 10$; $f(12 - x) = f(x)$ for all $x \in R$,then the value of $b$ is:

  • A
    $-3$
  • B
    $3$
  • C
    $6$
  • D
    $-6$

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