A split form displays data in two views from the same source

The question mark (?) after an element in a DTD means that:

a) there are many occurrences of that item. b) there could be any number of occurrences of that item. c) that item can appear at most once. d) All of the above

When a derived class contains a method or property that overrides a parent class method or property, how can you use the parent class version from within the subclass? Show an example of a derived class that overrides a parent class method, but then uses the parent class method.

What will be an ideal response?