A valid reason to declare a class as abstract is to:

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• Adefine methods within a parent class, which may not be overridden in a child class
• Bdefine common method signatures in a class, while forcing child classes to contain unique method
• Cprevent instance variables from being accessed
• Dprevent a class from being extended
• Edefine a class that prevents variable state from being stored when object Instances are serialized
• Fdefine a class with methods that cannot be concurrently called by multiple threads