1. Given the following code: public class Test ( static String message; private static class Worker extends Thread { public void run() ( try ( sleep (1000); } catch (InterruptedException e) {} message "I work."; public static void main(String args[]) throws InterruptedException { (new Worker()).start(); message = "I do not work."; Thread.sleep(2000); System.out.println(message); } a) [3 pts] The above program should print out "I work." Is it guaranteed to always do this? If not, why not? b) [3 pts] Would it help to change the parameters of the two invocations of Sleep? c) [4 pts] How would you guarantee that all changes to message will be visible to the main thread?