If $y = a^x \cdot b^{2x - 1}$,then $\frac{d^2y}{dx^2}$ is

  • A
    $y^2 \cdot (\log ab^2)$
  • B
    $y \cdot \log ab^2$
  • C
    $y^2$
  • D
    $y \cdot (\log ab^2)^2$

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