If $\ln(a + c)$,$\ln(c - a)$,and $\ln(a - 2b + c)$ are in $A.P.$,then

  • A
    $a, b, c$ are in $A.P.$
  • B
    $a^2, b^2, c^2$ are in $A.P.$
  • C
    $a, b, c$ are in $G.P.$
  • D
    $a, b, c$ are in $H.P.$

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