Consider the following code snippet: if (!stat("file.dat", buf)) return; sleep(10); // abort if file exists fp // sleep for 10 seconds // open file for write. fopen("file.dat", "w" ); fprintf(fp, "Hello world" ); close(fp); a. Suppose this code is running as a setuid root program. Give an example of how this code can lead to unexpected behavior that could cause a security problem. Hint: try using symbolic links. b. Suppose the sleep(10) is removed from the code above. Could the problem you identified in part (a) still occur? Please explain. c. How would you fix the code to prevent the problem from part (a)?