Can I please get a help for these questions? Thank you!

What happens if we execute the line: head=newIntNode(9,head) All the other nodes in the list are disconnected and get garbage collected. A node with 9 is placed before everything else in the list. If the head was null before, the code throws an exception. The head now points to a node with 9 in it that points back to itself. The code doesn't execute because it has a compiler error. Question 4 1 pts Assuming we don't use a tail pointer, then if "head" points to a list of three nodes, and we set the "head" to null, what happens? The list loses one element. The nodes are disconnected from each other. The three nodes are immediately destroyed. The list is now empty. Question 5 1 pts A friend writes code to add 5 to the end of a linked list. They write tail. addNodeAfter (5); What is wrong with this code? Check all that apply. It throws an exception if the list is empty. It doesn't catch the possible OutOfMemoryError. We need to set selection first. It doesn't allocate a new node. Sometimes head will need to be changed too. tail needs to be changed afterwards