Which part of the wheel shown is responsible for holding the tire beads in place?

Header and trailer nodes are used in DoublyLinkedList because:

A. they eliminate special cases that work with the front and end of the list B. without a header node, we can’t iterate forwards through the list and without a trailer node, we cannot iterate backwards through the list C. you can’t use the hash function without them D. All of the above

What are the five altitude metaphors for describing use case on different levels? What do they represent?

What will be an ideal response?