1Z0-809 Question #210: Real Exam Question with Answer & Explanation

Given the code fragments:

class R implements Runnable {
 public void run() { System.out.println("Run..."); }
}

class C implements Callable<String> {
 public String call() throws Exception { return "Call..."; }
}

and

ExecutorService es = Executors.newSingleThreadExecutor();
es.execute(new R()); // line n1
Future<String> f1 = es.submit(new C()); // line n2
System.out.println(f1.get());
es.shutdown();

What is the result?