What is the output of the following class? 

A. 2
B. 3
C. 4
D. None of the above

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1: package rocket; 2: public class Countdown { 3: 4: 5: 6: 7: 8: } public static void main(String[] args) { var builder = "54321"; builder builder.substring(4); } System.out.println (builder.charAt(2));