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Statements of which of the following kind should be placed in the Declarations section of a class code block?

(A) Public Event UserDefinedEvent(par1 As dataType1, par2 As dataType2, ...) (B) RaiseEvent UserDefinedEvent(arg1, arg2, ...) (C) Dim WithEvents object1 As ClassName (D) Private Sub object1_UserDefinedEvent(par1, par2, ...) _ Handles object1.UserDefinedEvent

Which of the following statements are true?

a. A subclass is a subset of a superclass. b. A subclass is usually extended to contain more functions and more detailed information than its superclass. c. "class A extends B" means A is a subclass of B. d. "class A extends B" means B is a subclass of A.