What is the time complexity of reversing a linked list iteratively and recursively?

The time complexity of reversing a linked list iteratively is O(n), where n is the number of nodes in the list. This is because in each iteration, you only need to traverse the list once to reverse the pointers. However, the time complexity of reversing a linked list recursively is also O(n), but with a caveat. If the recursive approach is not optimized, it can lead to a time complexity of O(n^2) due to repeatedly traversing the list for each recursive call. Therefore, it's crucial to implement the recursive reversal with proper base cases and efficient pointer manipulation to achieve O(n) time complexity.