Olymorphism", n Based on what we have learnt in our course with our course materials, answer the following questions. a) There are three major object-oriented features in object-oriented programming. Except name the other two and briefly introduce these two. 20 SPACE PTRICE colla String[] sidA = { "1", "2", "3", "4", "5", "6", "7", "8"}; b) Given the above example array (Use your Student ID number, suppose the student ID number is 12345678 in the above example), answer the following questions: i. What is the index number of the last element in the array sidA? ii. What is value of (sidA.length + sidA[0].length() + sidA [6])? Write one statement to only declare a variable of class type ArrayList, which is restricted to contain string elements only. iv. Write only a for-loop to add all elements of array sidA into the ArrayList above, in a reverse order, and thus adding the last element of sidA first etc