Declarations and Access Control Logic

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Question : 26 of 29

Marks: +1, -0

Which declare a compilable abstract class? (Choose all that apply.)

public abstract class Canine { public Bark speak(); }
public abstract class Canine { public Bark speak() { } }
public class Canine { public abstract Bark speak(); }
public class Canine abstract { public abstract Bark speak(); }

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