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A.public class Circle implements Shape {private int radius；}
B.public abstract class Circle extends Shape {private int radius；}
C.public class Circle extends Shape {private int radius；public void draw（）；}
D.public abstract class Circle implements Shape { private int radius；public void draw（）；}
E.public class Circle extends Shape {private int radius；public void draw（） {/* code here*/}}

A.Compilation fails.
B.An exception is thrown at runtime.
C.The code executes normally and prints "foo".
D.The code executes normally， but nothing is printed.