यदि $f(x)=b \cdot e^{a x}+a \cdot e^{b x}$ है,तो $f^{\prime \prime}(0)=$

  • A
    $(a+b)$
  • B
    $a b(a+b)^2$
  • C
    $2 a b(a+b)$
  • D
    $a b(a+b)$

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