Final answer:
Hybrid inheritance is a combination of multiple inheritance and multilevel inheritance in object-oriented programming.
Step-by-step explanation:
Hybrid inheritance is a combination of multiple inheritance and multilevel inheritance in object-oriented programming. In the provided Java program, the classes A, B, and D are subclasses of class C. Class A and class B both inherit from class C, representing single inheritance, while class D inherits from class A, demonstrating multilevel inheritance. This combination of different types of inheritance results in hybrid inheritance.