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Which of the following is true for Namespaces?

1. NameSpace Logically group types, example System.Web.UI logically groups our UI related features.
2. In Object Oriented world many times its possible that programmers will use the same class name.By qualifying NameSpace with classname this collision is able to be removed.
3. Namespace can span multiple assembly.
4. A namespace is an organization construct. It helps you find and understand how your code base is arranged. Namespaces are not essential for C# programs. They are usually used to improve the code's understandability.
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