यदि $y^2+z^2=a y z$,$z^2+x^2=b x z$,और $x^2+y^2=c x y$ है,तो $\frac{x z}{y^2}+\frac{y^2}{z x}$ का मान क्या है?

  • A
    $a^2-b^2+c^2$
  • B
    $a^2+b^2+c^2$
  • C
    $a c-b$
  • D
    $a b-c$

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