Consider the following statements about conditions that make a metal semiconductor contact rectifying N type semiconductor with work function s more than work function M of metalN type semiconductor with work function s less than work function M of metalP type semiconductor with work function s more than work function M of metalP type semiconductor with work function s less than work function M of metal. Of these statements

• A. 1 and 3 are correct
• B. 2 and 3 are correct
• C. 1 and 4 are correct
• D. 2 and 4 are correct