In the following program: public class Problem2{ public static int sample(int x, int y){ int z; ...... } public static void main(String[] args) { int a, b; ...... sample(a,b); } } (1) What is the return type of sample? (2) What are the local variables of sample? (3) What are the parameters of sample? (4) What are the arguments of sample? (5) Is sample a per-object method? Or a per-class method? (6) Is sample a public method, or private method?