Consider the code below that uses the fork system call: #include int main() { printf("%d ",getpid()); fork(); // fork A printf("%d ",getpid()); fork(); // fork B printf("%d ",getpid()); fork(); // fork C printf("%d ",getpid()); fork(); // fork D printf("%d ",getpid()); return 0; } Answer the questions below. a. How many processes are created in total by this program (not including the original process). b. Identify the parent/child relationships between the processes.