Which of the following classes defines a legal abstract class?
(a)
class A {
abstract void unfinished() {
}
}
(b)
public class abstract A {
abstract void unfinished();
}
(c)
class A {
abstract void unfinished();
}
(d)
abstract class A {
protected void unfinished();
}
(e)
abstract class A {
abstract void unfinished();
}
(f)
abstract class A {
abstract int unfinished();
}
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