Select the correct statement s from the following I In conductors the valence and conduction bands m...........

Select the correct statement(s) from the following.

I. In conductors, the valence and conduction bands may overlap.

II. Substances with energy gap of the order of 10 eV are insulators.

III. The resistivity of a semiconductor increases with increase in temperature.

IV. The conductivity of a semiconductor increases with increase in temperature.