Problem 4: Linked List Recursion Tracing Consider the following C++ code. All of the points for this problem will be assigned based on your explanation, since we have full faith in your ability to run this program and copy down the answer. Question a: What linked list is returned if llrec is called with the input linked lists in 1=1,2,3,4 and in 2=5,6? Question b: What linked list is return if Urec is called with the input linked lists in 1= nullptr and in 2=2? To show work, you can draw a call tree or box diagram of the function calls using some simplified substitution of your choice rather than pointer values (e.g. "p3" for a pointer to a node with value 3). Submit your answers as a Markdown or PDF file showing your work and derivations supporting your final answer. You must name the file q4_answers.pdf or q4_answers.md. Upload this file to the hw1 folder