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Which of the following statements is correct?

1.  Magnets undergo self-demagnetisation if keepers are placed across both ends of the magnets.

2. A horseshoe magnet has only one pole.

3.  A copper wire gets attracted by a magnet.

4. A magnet does not lose its magnetism on hammering.

A) 1, 2 and 3

B) 2, 3 and 4

C) 1, 3 and 4

D) All the above

E) None of these