多选题 Given two files:
1. package com;
2. public class Extramuros {
3. public static void howdy() {System.out.print("howdy "); }
4. public static final Extramuros ex = new Extramuros();
5. public int instVar = 42;
6. public enum avout {OROLO, JAD};
7. }
1. // insert code here
…
6. public class Theorics {
7. public static void main(String[] args) {
8. Extramuros.howdy();
9. System.out.print(Extramuros.avout.OROLO + " ");
10. howdy();
11. System.out.print(ex.instVar + " ");
12. }}
Which are the minimum line(s) of code to add at "insert code here" for the files to compile? (Choose all that apply.)