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5. a) What is blank or uninitialized final variable? How to initialize blank final variable? b) What is the output of this program? class Base { protected void foo() {} } class Derived extends Base { void foo() {} } public class Main { public static void main(String args[]) { Derived d = new Derived(); d. foo(); } } c) What is the difference between "compile time polymorphism" and "run time polymorphism". Explain clearly with simple code examples.