If $a_1, a_2, \dots, a_n$ are positive real numbers such that $a_1 \cdot a_2 \cdot \dots \cdot a_n = 1$,then their sum is:

  • A
    $A$ positive integer.
  • B
    Divisible by $n$.
  • C
    Not less than $n$.
  • D
    None of these.

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