Please answer all the following

QUESTION 17 Consider a singly linked list of the form where F is a pointer (reference) to the first element in the list and Lis a pointer (reference) to the last element in the list. The time of which of the following operations depends on the length of the list? O Delete the last element of the list Delete the first element of the list O Add an element after the last element of the list O Add an element before the first element of the list O Interchange the first two elements of the list QUESTION 18 All the items in a list must be of the same data type. O True False