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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Suman Kumar
option D is correct
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.slideshare.net/mobile/ISFCPISFCollegeofPha/polarography-102585040&ved=2ahUKEwjd7_OF3ODrAhVf63MBHVjMBt0QFjACegQIAxAB&usg=AOvVaw2-Z5Mtr8vFtxs_CmyK2Uob