Find a vector-valued function whose graph is the plane x+y+z== a. r(u,v)=ui-vj-(3-u-v)k b. r(u,v)= ui+vj+(3-u-v)k c. r(u,v) = ui+vj+(3+u+v)k C. d. r(u,v)= ui+vj-(3+u+v)k e. r(u,v)=-ui-vj+(3-u-v)k

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