Which of the following statements are correct about a namespace used in C#.NET?
- Classes must belong to a namespace, whereas structures need not.
- Every class, struct, enum, delegate and interlace has to belong to some or the other namespace.
- All elements of the namespace have to belong to one file.
- If not mentioned, a namespace takes the name of the current project.
- The namespace should be imported to be able to use the elements in it.
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