What is printed if we run class CountDown below, public class CountDown { public static void countDown(int x) { System.out.print("x:"+x); if (x > 1) countDown(x-1); System.out.print("x="+x); } public static void main(String[] args) { countDown(2); } } a. X:18:2x=2x=1 O b. 2=x1=x:2x:x C. X:18:1x=1x=1 O d. x:2x:1x=1x=2