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1. When you use the static var keywords to declare a type property:
   1. You cannot override the type property in the subclasses.
   2. You can override the type property in the subclasses.
   3. You can override the type property only in the superclass.

2. When you use the class var keywords to declare a type property:
   1. You cannot override the type property in the subclasses.
   2. You can override the type property in the subclasses.
   3. You can override the type property only in the superclass.

3. When you use the final keyword to declare an instance method:
   1. You cannot override the instance method in the subclasses.
   2. You can override the instance method in the subclasses.
   3. You can override the instance method only once, that is, in just one subclass.

4. Polymorphism means:
   1. We can call the same method--that is, the same name and arguments--in instances of classes that aren't included in the same hierarchy tree.
   2. We can use the same method--that is, the same name and arguments--to cause different things to happen...