3. Consider the following code segment: int pid = fork(); int c = 5; if (pid == 0) /* child process */ { fork(); c += 10; } else { c += 5; } Answer the following questions: a) How many different copies of the variable c are there? What are their values? (Hint: every process has a different copy of variable c) (10 points) b) Draw the tree structure of processes (you might want to review the examples in chapter 3 slides). (5 points)