Questions 3 & 4 I need help on and more insight please

Question 3 (2 points) Adding a 'tail' attribute to the linked list will make the list Extra code logic to update and keep the 'tail' attribute valid More efficient to add an element to any location in the list More efficient to add an element to the end of the list More efficient to add an element to the front of the list Question 4 (2 points) The 'sentinels' used in the linked list will take extra space, but they help unifying the variations of element addition and deletion operations True False