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C#.NET enum fundamentals: identify the correct facts about the enum keyword and the System.Enum class.

Difficulty: Easy

Correct Answer: 2, 5

Explanation:


Introduction / Context:
This conceptual question distinguishes the C# language keyword enum from the .NET base class System.Enum and clarifies namespaces.



Given Data / Assumptions (Statements to evaluate):

  • 1) To use the keyword enum, we should either use [enum] or System.Enum.
  • 2) enum is a keyword.
  • 3) Enum is a class declared in System.Type namespace.
  • 4) Enum is a class declared in the current project's root namespace.
  • 5) Enum is a class declared in System namespace.


Concept / Approach:
In C#, enum is a built-in language keyword for declaring enumerations. All enum types ultimately derive from System.Enum, which itself lives in the System namespace. There is no bracketed [enum] syntax in C#, and System.Enum is not in System.Type.



Step-by-Step Solution:

Statement 1 → False: There is no [enum] attribute; and using the enum keyword does not require referencing System.Enum explicitly.Statement 2 → True: enum is a reserved keyword.Statement 3 → False: System.Enum is in System, not System.Type.Statement 4 → False: It is in the System namespace, not your project root.Statement 5 → True: Correct location is System.Enum.


Verification / Alternative check:
Use an IDE tool-tip or documentation to confirm namespace and type hierarchy: Enum : ValueType : Object.



Why Other Options Are Wrong:
Any option including 1, 3, or 4 contains false statements about syntax or namespaces.



Common Pitfalls:
Confusing the language keyword (enum) with the System.Enum type or assuming special attribute-like syntax exists for enum declarations.



Final Answer:
2, 5

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