For an unsorted singly linked list with a head and tail references, which of the following operations can be implemented in constant time? Choose the most comprehensive option. (1) Insertion at the front of the linked list (2) Insertion at the end of the linked list (3) Remove the front node of the linked list (4) Remove the last node of the linked list

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A: The code is below:

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A: Its an efficient way of appending in tail pointer to a linked list. For detailed check below.