1. Which of the following class definitions defines a legal abstract class? a. class A (abstract void unfinished) b. class A (abstract void unfinished;) c. abstract class A fabstract void unfinished0: d. public class abstract A (abstract void unfinished0: 2. Which of the following declares an abstract method in an abstract Java class? a. public abstract method0: b. public abstract void method): c. public void abstract method0 d. public void method 0 e. public abstract void method() i 3. Which of the following statements regarding abstract methods is false? a. An abstract class can have instances created using the constructor of the abstract class. b. An abstract class can be extended. C. A subclass of a non-abstract superclass can be abstract. d. A subclass can override a concrete method in a superclass to declare it abstract. e. An abstract class can be used as a data type. 4. Analyze the following code. Which of the following statements is correct? public class Test f public static void main(Stringl) args) ( Number x-new Integer(3); System.out.printin(x.intValue()); System.out.printin(x.compareTo(new Integer(4)): e program has a compile error because an Integer instance cannot be assigned to a Numbe variable b. The program has a compile error because intValue is an abstract method in Number. c. The program has a compile error because x does not have the compare To method. d. The program compiles and runs fine