what is the purpose of readonly keyword in c, Basic, C#.NET

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Question:What is the purpose of the readonly keyword in C#?

A It makes a field immutable after initialization. 
B It prevents a field from being serialized. 
C It restricts a variable's scope. 
D It creates a constant variable.

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+ AnswerA

+ ExplanationIt makes a field immutable after initialization.
Analysis: The readonly keyword allows a field to be assigned only during declaration or in the constructor of the class, making it immutable thereafter, but unlike const, it can be set at runtime.

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