What is the output of this program? import java.util.*; class Arraylist { public static void main(String args[]) { ArrayList obj = new ArrayList(); obj.add("A"); obj.add("B"); obj.add("C"); obj.add(1, "D"); System.out.println(obj); } }

• A. [A, B, C, D].
• B. [A, D, B, C].
• C. [A, D, C].
• D. [A, B, C].