C++ linked list questions

QUESTION 1 Suppose that the pointer m_head points to the first node in the list, and the link of the last node is nullptr. The first node of the linked list contains the address of the node. m_head first second tail QUESTION 2 What is the purpose of the following code? current m head; while (current - nullptr) { //Process current current current->link: Traversal of a linked list Selection of a node Insertion of a node Creation of a new list QUESTION 3 Because each node of a linked list has two components, we need to declare each node as a(n). index and element reference and string class or struct int and object