Permissions commands and options. Provide commands with screenshots. (10 pts) a) Create a new file in the Labs directory. What is the default permission for this file? b) Set the directory permission to 400. What does it mean? c) Set the directory permission to 100. What does it mean? d) Set the directory permission to 200. What does it mean? e) Create a new user called Mybuddy. What are the permissions for Mybuddy? f) How would you change the permissions for Mybuddy?