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

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