Select the incorrect statement among the following.

Options

A. Metals having conductivities in the order of `10^7Omega^(-1)m^(-1)` are good conductors
B. Solids having conductivities range `10^(-6)` to `10^4Omega^(-1)m^(-1)`are termed as semiconductors
C. Solids having conductivities range `10^(-10)` to `10^(-20)Omega^(-1)m^(-1)`are termed as insulators
D. Conductivity of `TiO_3` is independent of temperature