If $m$ is the order and $n$ is the degree of the differential equation $\left(\frac{d^2 y}{d x^2}\right)^5+4 \frac{\left(\frac{d^2 y}{d x^2}\right)}{\left(\frac{d^3 y}{d x^3}\right)}+\left(\frac{d^3 y}{d x^3}\right)=x^2-1$,then:

  • A
    $m=3, n=1$
  • B
    $m=3, n=2$
  • C
    $m=3, n=3$
  • D
    $m=3, n=5$

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