Question $2$

Find the general form, $f(x)=y,$ of the function whose second derivative is: $x^2-\sqrt[\phantom{2}]{x}$

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$($A$)y=\frac{x^4}{12}-\frac{4}{15}{x}^{\frac{5}{2}}C$

$($B$)y=\frac{x^4}{12}-\frac{4}{15}{x}^{\frac{5}{2}}{C}_{1}x{C}_2$

$($C$)y=\frac{x^4}{12}-\frac{2}{3}{x}^{\frac{5}{2}}{C}_{1}x{C}_2$