Give a parametric description of the form r(u,v) = (x(u,v). y(u.v).z(u,v)) for the following surface. The portion of the cylinder x? +y? = 9 in the first octant, for 0szs3 Select the correct choice below and fill in the answer boxes to complete your choice. (Type any angle measures in radians. Use angle measures greater than or equal to 0 and less than 2x. Type exact answers in terms of x.) O A. r(u,v) = (3 sin u cos v,3 sin u sin v,3 cos u), for O B. r(u,v) = (9 sin u cos v,9 sin u sin v,9 cos u), for Sus and Svs Sus and SVS Oc. r(u,v) = (3 cos u,3 sin u, v) , for Sus and SVS O D. r(u,v) = (3 sin u,3 cos v,v), for sus and