Question: What does the line [ ListNode mergedList = merger.mergeKLists ( lists ) ; ] do ? Merge the sorted lists Merge the head nodes only

What does the line [ ListNode mergedList = merger.mergeKLists(lists); ] do?
Merge the sorted lists
Merge the head nodes only
This won't work
Merge the un-sorted lists
What does the line [ ListNode mergedList = merger.mergeKLists(lists); ] do?

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