Which XXX completes the prepend$()$ method in the Python LinkedList class for a

doubly$-$linked list?

def prepend$($self$,$ new$\_$node$)$:

if self.head $==$ None:

self.head $=$ new$\_$node

self.tail $=$ new$\_$node

else:

new$\_$node.next $=$ self.head

XXX

self.head $=$ new$\_$node

new$\_$node.prev $=$ self.head

self.tail $=$ new$\_$node

self.head.next $=$ new$\_$node

self.head.prev $=$ new$\_$node