In which interval is the given function $f(x) = 2x^3 - 15x^2 + 36x + 1$ monotonically decreasing?

  • A
    $[2, 3]$
  • B
    $(2, 3)$
  • C
    $(-\infty, 2)$
  • D
    $(3, \infty)$

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