Merge Two Sorted Linked Lists In Reverse Order

|     Approaches     | Time Complexity | Space Complexity |
+==================+=================+==================+
| Reversing the lists and merging  | O(n)   | O(n)      |
+------------------+-----------------+------------------+
| Merging the list and reversing   | O(n)   | O(n)      |
+------------------+-----------------+------------------+
| Iterative Approach               | (On)   | O(1)      |
+------------------+-----------------+------------------+