Four identical rods (same length and cross-section) are made of silver, copper, iron, and glass. Their ends are kept at 100∘C and 0∘C. Which sequence correctly ranks the rods from greatest to least rate of heat conduction?
a) Copper > Silver > Iron > Glass
b) Silver > Copper > Iron > Glass
c) Silver > Copper > Glass > Iron
d) Iron > Silver > Copper > Glass