The volume of the solid generated by revolving the region bounded by x2=4y and y2=4x about y=4 is to be solved using the circular ring method. The formula for solving for the volume is given by V= -S" x (r.²- r,²) dh. What is the expression 2_r, a corresponding to "? A 4-2√x B 4 4 ©2√y- D 4-y 4

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