Q. If class Dog has a subclass Retriever, which of the following is true?
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(A)
Because of single inheritance, Dog can have no other subclasses.
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(B)
Because of single inheritance, Retriever can extend no other class except Dog.
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(C)
The relationship between these classes implies that Dog “is-a” Retriever.
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(D)
The relationship between these classes implies that Retriever “has-a” Dog.
✅ Correct Answer: (B)
Because of single inheritance, Retriever can extend no other class except Dog.