Assume that a Stack is implemented in a class named $$StackLinkedList$$ with using a singly unordered linked list that has String nodes. If the elements $\{$K$,$L$,$M$,$N$,$O$,$P$,$Q$\}$ are placed in this stack, after three delete operations, which elements will be removed from the list?

Your answer:

$\{$N$,$O$,$P$,$Q$\}$

$\{$O$,$P$,$Q$\}$

$\{$K$,$L$,$M$\}$

$\{$K$,$L$,$M$,$N$\}$