JAVA CERTIFICATION QUESTION: The allowable subtypes in sealed classes

Given the sealed Bird class

public sealed class Bird permits Sparrow {}

Which Sparrow class definitions, when used independently, are valid? Choose two.

A. non-sealed class Sparrow extends Bird { }

B. public class Sparrow extends Bird { }

C. protected class Sparrow extends Bird { }

D. final class Sparrow extends Bird { }

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