How do access modifiers in X++ affect the visibility of class members?

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In X++, access modifiers determine the visibility of class members (variables and methods). The three access modifiers are:

Private: The variable or method is only usable within the class it is defined in.
Protected: The variable or method is usable within the class it is defined in and any subclass of that class.
Public: The variable or method is usable anywhere. If no modifier is provided, the default is public.

How do access modifiers in X++ affect the visibility of class members?

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