Match each item with a statement below.

A. A class that has inherited from a base class, also known as a derived class.
B. A synonym for base class.
C. Can be used by a class and its descendants.
D. Using the same method name to indicate different implementations.
E. The ultimate base class for all other types.
F. Returns a string containing an object's class.
G. Occurs when two reference type objects refer to the same object.
H. Returns true if two Objects have the same memory address.
I. A class that cannot be extended.
J. Static methods that act like instance methods.

A. extended class
B. superclass
C. protected members
D. polymorphism
E. System.Object
F. GetType()
G. reference equality
H. Equals()
I. sealed class
J. extension methods