If $y$ represents pressure and $x$ represents velocity gradient, then the dimensions of $\frac{d^2 y}{d x^2}$ are
  • A$\left[ ML ^{-1} T ^{-2}\right]$
  • B$\left[ M ^2 L ^{-2} T ^{-2}\right]$
  • C$\left[ ML ^{-1} T ^0\right]$
  • D$\left[ M ^2 L ^{-2} T ^{-4}\right]$
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