What operation is performed by the following $C++$ code snippet on a linked list?

Node$*$ temp $=$ head;

while $($temp $0$ & & temp$->$next $,0)\{$

Node$*$ nextNode $=$ temp$->$next;

temp$->$next $=$ nextNode$->$next;

delete nextNode;

temp $=$ temp$->$next;

$\}$

a$.$ Removes duplicates from the linked list.

b$.$ Deletes all nodes except the first node in the linked list.

c$.$ Deletes all even$-$positioned nodes in the linked list.

d$.$ Deletes all odd$-$positioned nodes in the linked list.

Clear my choice