C1 and C2 are classes written in an object-oriented programming language (such as Java, C#, or C++). Which of the following statements are correct if C1 is a superclass of C2? a) C1 is always an abstract class. b) C2 contains all public features defined by C1. c) Each C2 object may be replaced by a C1 object. d) C2 is a subclass of C1.

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