Six wires are characterized by their dimensions and by the metal they are made from. Assume the tungsten alloy has exactly twice the resistivity of aluminum. Rank the wires in order of decreasing resistance.

(a) Diameter 2 mm, length 1 m, tungsten alloy
(b) Diameter 4 mm, length 2 m, tungsten alloy
(c) Diameter 2 mm, length 1 m, aluminum
(d) Diameter 1 mm, length 1 m, aluminum
(e) Diameter 2 mm, length 2 m, tungsten alloy
(f) Diameter 4 mm, length 4 m, aluminum