The code for implementing the String peek() operation is

Question

A stack based on a linked list is based on the following code
```
class Node
{
String element;
Node next;
Node(String el, Node n)
{
element = el;
next = n;
}
}
Node top = null;

```

A)
String temp = top.element;
if (temp != null)
return temp;
else
throw new RuntimeException("Empty Stack");
B)
if (top != null)
return top.element;
else
return top.next;
C)
if (top != null)
return top.element
else
throw new RuntimeException("Empty Stack");
D)
if (top != null)
return top;

Answer 1

C)
if (top != null)
return top.element
else
throw new RuntimeException("Empty Stack");