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                      Consider the following statements in respect of the laser beam welding:                      

1. It can be used for welding any metal or their combinations because of very high temperature of the focal points.

2. Heat affected zone is very large because of quick heating.

3. High vacuum is required to carry the process.

Which of the statements given above is/are correct?

A) 1 and 2 only                 

B) 2 and 3 only  

C) 1 only              

D) 1, 2 and 3