If $f(n) = n! (31-n)!$,where $n \in \{0, 1, 2, \ldots, 31\}$,then the minimum value of $f(n)$ is

  • A
    $(15!) (15!)$
  • B
    $(15!) (14!)$
  • C
    $(14!) (16!)$
  • D
    $(15!) (16!)$

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