Which of the following statement is correct_______________?

A. A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator

B. A semi-conductor is a material made of alternate layers of conducting material and insulator

C. A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator

D. A semi-conductor is one which conducts only half of the applied voltage

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