1) Under directory "lab2," what are the differences among the outputs of the commands "Is-1" "Is-al", and "1s -t1"? What are the differences between options"-a" and "-t?" 2) Under directory "lab2," if you execute command "touch testa", can you describe what has been changed and what has not been changed to file "test 4"? (Hint: you can use command "stat test 4" to see the changes before and after you executed "touch test 4" command) 3) If you would like the system to prompt you for your confirmation before deleting a file, what option do you need to use with command "rm"? Would you try it with file "test"? 4) Could you use "date" command to display the current date in "yyyy- mm-dd" format? Please provide the command you have used below