Element - Java Quiz Question

What will be the output of the following program?

import java.util.*;
public class Element {
    public static void main(String[] args) {
        ArrayDeque<Integer> e = new ArrayDeque<Integer>();
        e.add(20);
        e.add(30);
        e.add(40);
        int rv= e.element();
        System.out.println("Retrieved Element is = " + rv);
    }
}

	Retrieved Element is = 40
	Retrieved Element is = 30
	Retrieved Element is = 20
	Compilation Error or Runtime Error

Topic: Java ArrayDeque Class

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1	Collections2032
2	Add elements to ArrayDeque
3	Collections2102
4	Relation
5	ArrayDeque
6	Element
7	Remove
8	Get the first element from the given input
9	Insert given element at bottom
10	Insert given element at top
11	Remove first element from the Queue