1.) Please mark which file operations the various user types can perform by placing an "X" in the associated box on the corresponding row for each user type. You are to assume that a file with the permissions indicated resides in a directory with the permissions indicated and you indicate what the user types can do with the file: Directory Permissions are: drwxr-xr-x File Permissions are: -rwxrwxr-- User (owner) can : Read[ ] Modify [ ] Delete [ ] Execute [ ] Group members can: Read[ ] Modify [ ] Delete [ ] Execute [ ] Other users can : Read[ ] Modify [ ] Delete [ ] Execute [ ] 2.) If a file named "myfile" has -r--r--r-- permissions. Write the command to change it to -rwxr-xr-- permissions using both the octal and symbolic modes of the appropriate command (octal mode was included in the instructor's lecture and published on this web site in the files area, it is not the textbook). command in symbolic mode: command in octal mode: 3.) Write the (one, single) command that will change your shell environment such that new regular files you create will have permissions -rw-rw-r-- by default, and new directories you create will have permissions drwxrwxr-x by default: command: