Assuming head refers to the first node in a non-empty chain of nodes, which of the following code snippets will correctly remove only the first node from the chain of nodes? head = head. next head = null; Node curr = head; curr = curr. next; head. next = null head. data = null Assuming head refers to the first node in a non-empty chain of nodes, what would the following line of code accomplish? head. next = null; remove only the first node from the chain remove all nodes after the first node remove only the second node from the chain remove all nodes from the chain