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Which one of the following is not correct?

A)  Successor of a number can be obtained by adding 1

B)  The difference between successor and predecessor of a number is smallest composite number

C) Successor of greatest 5 digit number is smallest six digit number and predecessor of smallest 6 digit number is greatest 5 digit number

D)  The difference between lowest natural number and whole number is 1

E)  None of these