Volume With Rectangular Cross Sections

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A solid has rectangular cross sections perpendicular to the x-axis. For the interval $[a, b]$ , the base of each rectangle is given by the function $f(x)$ and the height is a constant 4. Which of the following integrals represents the volume of the solid?

$\int_a^b f(x)^4 \, dx$

$4\int_a^b f(x) \, dx$

$\int_a^b (4f(x))^2 \, dx$

$\int_a^b 4f(x) \, dx$

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