If $y^2+z^2=3yz$,$z^2+x^2=8zx$,and $x^2+y^2=4xy$,then the value of $\frac{y^2}{xz}+\frac{xz}{y^2}$ is

  • A
    $2$
  • B
    $3$
  • C
    $4$
  • D
    $5$

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