UGC NET Geography Q89

Question

Which of the following statement about Alternative Dot Methods is correct?
(1) In Stilgenbaur's method, urban population is shown using sphere and rural population with uniform dots.
(2) Both rural and urban population is shown using uniform dots.
(3) In Sten de Geer's Method, urban population is shown using circles and rural population with uniform dots.
(4) Sten de Geer's Method uses sphere to show urban population and uniform dots to show rural population