Intrinsic semiconductor (Pure semiconductor) \(\rightarrow\) Fermi-level in the middle of valence and conduction band. \(n\)-type semiconductor \(\rightarrow\) Fermi-level near the conduction band. Extrinsic semiconductor is of two types \(p\)-type semiconductor \(\rightarrow\) Fermi-level near the valence band. Metals \(\rightarrow\) Fermi-level inside the conduction band Hence, \(\mathrm{A}-\mathrm{Q}, \mathrm{B}-\mathrm{R}, \mathrm{C}-\mathrm{P}, \mathrm{D}-\mathrm{S}\)