A Stack Based on a Linked List Is Based on the Following

question 18

Multiple Choice

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;
The code for implementing the String peek() operation is

• 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;

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Definitions:

Glomerulus

A network of small blood vessels located in the kidney that performs the first step of filtering blood to form urine.

Renal Medulla

The inner region of the mammalian kidney. Compare with renal cortex.

Renal Pyramids

Cone-shaped structures located in the kidneys, composed of tubules that are essential for urine formation.

Bowman's Capsules

Cup-shaped structures in the kidneys that encase the glomeruli and initiate the process of blood filtration and urine formation.