What is the functionality of the following code?

public void function $($Node node$)$

$\{$

if $($size $==0)$

head $=$ node;

else

$\{$

Node temp, cur;

for $($cur $=$ head; $($temp $=$ cur.getNext$())!=$null; cur $=$ temp$)$;

cur.setNext$($node$)$;

$\}$

size$++$;

$\}$

Question $5$ options:

Inserting a node at the beginning of the list

Deleting a node at the beginning of the list

Inserting a node at the end of the list

Deleting a node at the end of the list