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If $\text{y}=\text{a}+\text{bx}^2,\text{a,b}$ arbitrary constants, then

• A
  $\frac{\text{d}^2\text{y}}{\text{dx}^2}=2\text{xy}$
• ✓
  $\text{x}\frac{\text{d}^2\text{y}}{\text{dx}^2}=\text{y}_1$
• C
  $\text{x}\frac{\text{d}^2\text{y}}{\text{dx}^2}-\frac{\text{dy}}{\text{dx}}+\text{y}=0$
• D
  $\text{x}\frac{\text{d}^2\text{y}}{\text{dx}^2}=2\text{xy}$