Question: When a new node is inserted to the head of a linked list, will head and tail be changed? If the list is empty before

When a new node is inserted to the head of a linked list, will head and tail be changed?
If the list is empty before the insertion, both head and tail will change.
If the list is not empty before the insertion, head will change.
head will always change, but tail may change too.
All of the above

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