What operation does the following code snippetperform?

void methodName$($int value$)\{$

Node $**$ newNode $=$ new Node$($value$)$;

newNode$->$prev $=$ tail;

newNode $$ next $=$ nullptr;

if $($tail $!=$ nullptr$)\{$

tail$->$next $=$ newNode;

$\}$

tail $=$ newNode;

if $($head $==$ nullptr$)\{$

head $=$ newNode;

$\}$

$\}$

delete a node at the head of a singly linked list

insert a node at the head of a doubly linked list

insert a node at the tail of a singly linked list

Insert a node at the tail of a doubly linked list