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4. a) What is meant by inheritance in OOP? Why does not Java support multiple inheritance? b) What will be the output of the following Java code? // filename Main.java class Main { public static void main(String args[]) { System.out.println(fun()); } } int fun() { } return 20; c) Consider a class called Fraction that has two data members, an int numer and an int denom (for the numerator and denominator), write the following Java code: Write a constructor that accepts values for the numerator and denominator as arguments.