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Given below are the use of computer in Railway and Airlines. Which of the following are correct?

1. Now a day, we get e-tickets, hence computers are used for reservation.

2. We cannot use a computer as a tutor because a computer is an electronic device.

3. Computers are used for staff training in railways and airlines.

A)  1 and 2           

B)  2 and 3

C)  1 and 3

D)  All are correct

E)  None of these