Determine which of the following is the appropriate integrand needed to determine the volume of the solid obtained by rotating around the vertical axis given by x = −1 the area that is between the curves y = ƒ(x) and y = g(x) over the interval [a, b], where a ≥ 0 and ƒ(x) ≥ g(x) over that interval.

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(a) x(f(x) g(x)) (b) (x + 1)(f(x) - g(x)) - (c) (d) (x - 1)(f(x) = g(x)) - (e) x(f(x + 1)- g(x + 1)) x((f(x)-1)-(g(x) - 1))