Which statement is correct concerning Unique Key?

 Posted by vishalneeraj-24503 on 1/2/2015 | Category: Sql Server Interview questions | Views: 1782 | Points: 40
Select from following answers:
  1. Unique key can accept only one null value.
  2. By default,Unique key is a unique non-clustered index.
  3. We can have more than one unique key in a table.
  4. In Sql Server,Unique key can be made foreign key into another table.
  5. All Above

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