Volume by Revolution About the X-Axis

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Let R be the region in the first quadrant bounded by the graphs of $y=x^2+1$ , $y=5$ , and $x=0$ . What is the volume of the solid generated by revolving R about the x-axis?

$\pi\int_0^2[5^2+(x^2+1)^2]dx$

$\pi\int_0^2[(5-x^2-1)^2]dx$

$\pi\int_0^2[25-(x^2+1)^2]dx$

$\pi\int_1^5[25-y^2]dy$

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