The resistivity, $,$ depends only on the material from which a wire is made. Consider the resistivities of conductors and insulators. Which statement is true?

a$.$

Both insulators and conductors have very large

b$.$

Both insulators and conductors have very small

c$.$

Insulators have very large ; conductors have very small

d$.$

Insulators have very small ; conductors have very large

e$.$

All materials in nature have exactly the same