Give proper explanation

Dear student,
The p-n Junction in which no external voltage is applied is called zero bias p-n junction. Zero bias p-n Junction is also called as unbiased p-n junction.The free electrons move from n-region (high concentration region) to p-region (low concentration region) and holes diffuse from p-side to n-side. In an unbiased p-n junction, there is only the internal barrier potential, in which n side is at a higher potential and p side is at a lower potential.
Therefore , answer is 2.)
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