What is a pointer variable in C++? Show how a pointer variable can be declared and how they can be initialised. Use a diagram to represent what is happening in computer memory of support your answer 3 (a) (10 marks) Provide an outline for the algorithm to delete a node from a singly linked list. Use a diagram to support your answer. (b) (12 marks) Write a C++ function that could be used to compare two linked lists. Assume the nodes of each list consist of a single int and a pointer. The function should transverse both lists and compare the int values contained in each node. If the values are the same for each pair of nodes compared the function should return true. (c) (8 marks)