Given a singly linked list contains six nodes and simply show as $6->5->4->3->2->1,$ where the head reference refers to the first node $($contains $6$ as its item$).$ What is the first node $($referred by head$)$ if the following statements are applied?

Node prev $=$ head;

Node curr $=$ head;

while$($curr$!=$null && curr.next!$=$null$)\{$

if$($prev$.$element $\%2==0)\{$

prev $=$ curr;

curr $=$ curr.next;

$\}$

else$\{$

prev $=$ prev.next;

curr $=$ curr.next.next;

$\}$

$\}$

head $=$ prev;

Question $1$ options:

A$)$

$3$

B$)$

$4$

C$)$

$5$

D$)$

$2$