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Consider the following statements :

Statement 1: A computer is used for billing at the shops.

Statement 2: A computer is used for booking tickets at railway station.

Statement 3: A computer is used by Doctors to diagnose the diseases.

Which one of the following is correct about the above statements?

A)  Statement 1 is true

B)  Statement 2 is true

C)  Statements 3 is true

D)  All are true

E)  None of these