In a semiconductor A. there are no free electrons at any temperature B. there are no free electrons at 0 K (zero Kelvin) C. the number of free electrons is less than that in a conductor D. the number of free electrons increases with temperature Choose the correct answer from the options given below:

B only D only A and B only B, C and D only

B, C and D only

The correct answer is Option (4) → B, C and D only