What is the right code for String remove() operation? Such an operation removes and returns an element from the queue.

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;

```

A) ```
if (rear== null)
throw new RuntimeException("Empty");
String temp = rear.element;
rear = rear.next;
if (front == null)
rear = null;
return temp;

B) ```
if (front == rear)
throw new RuntimeException("Empty");
String temp = front.element;
front = front.next;
if (front == null)
rear = null;
return temp;

C) ```
if (front == null)
throw new RuntimeException("Empty");
String temp = front.element;
front = front.next;
if (front == null)
front = rear;
return temp;

```

D) ```
if (front == null)
throw new RuntimeException("Empty");
String temp = front.element;
front = front.next;
if (front == null)
rear = null;
return temp;

```

D) ```
if (front == null)
throw new RuntimeException("Empty");
String temp = front.element;
front = front.next;
if (front == null)
rear = null;
return temp;

```