Can you tell me the three levels of method access control for classes and modules? What do they imply
about the method?

In Ruby, the three levels of method access control for classes and modules are public, protected, and private. Each level has specific implications for how the methods can be accessed and used within and outside of classes and modules.

1. Public Methods:

   • Implication: Public methods are the most accessible level of method visibility. They can be called from any other code anywhere outside the class or even from different modules. This includes subclasses and completely unrelated classes. Public methods form the "interface" of the class, which means they are meant to be accessible and usable by any other part of the program. This is the default visibility for methods in Ruby unless specified otherwise[1][2][4][5][8].

2. Protected Methods:

   • Implication: Protected methods are less accessible than public methods. They can only be called within the same class or by subclasses, but not from outside these. Unlike private methods, protected methods can be called by any instance of the class they belong to or any instance of the subclasses. This means that an object of a class can call protected methods on another object of the same class or its subclasses. This level of access is typically used to compare objects of the same class (like in the implementation of an equality method)[1][2][4][5][8].

3. Private Methods:

   • Implication: Private methods are the most restrictive in terms of accessibility. They can only be called within the context of the current object. You cannot call a private method with an explicit receiver—even if that receiver is self. This means privat...