Final answer:
The default scope for prototype statements is public. In programming languages like JavaScript, where prototype-based inheritance is used, methods and properties added to a prototype are accessible to all instances of the constructor function.
Step-by-step explanation:
The default scope for prototype statements in a programming context, particularly when dealing with languages such as JavaScript, is public. This means that when a property or method is added to a prototype, it can be accessed by any other code that can access the object whose prototype has been extended. For example, when adding a method to the prototype object of a constructor function, all instances created using that constructor function will have access to the method.
Now, any instance of Person, such as var person1 = new Person('Alice');, will have access to the greet method, demonstrating the default public scope of prototype statements.