What is the functionality of the following code?

[answerhappygod]

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++;
}
a) Inserting a node at the beginning of the list
b) Deleting a node at the beginning of the list
c) Inserting a node at the end of the list
d) Deleting a node at the end of the list