If $f(x) = \begin{cases} x^2 + \alpha, & x \ge 0 \\ 2\sqrt{x^2 + 1} + \beta, & x < 0 \end{cases}$ is continuous at $x = 0$ and $f(\frac{1}{2}) = 2$,then $\alpha^2 + \beta^2$ is

  • A
    $3$
  • B
    $\frac{8}{25}$
  • C
    $\frac{25}{8}$
  • D
    $\frac{1}{3}$

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