Question $10$

A queue based on a linked list uses the following code

class Node

$\{$ String element;

Node next;

Node $($String el$,$ Node $n)$

element $=el$;

next $=n$;

$\}$

$\}$

Node front $=$ null, rear $=$ null;

What is the correct code for void add$($String $x)$ operation? Such an operation adds $x$ to the queue.