Alice and Bob are taking one CS courses. Carl is the TA and David is the instructor. You are asked to maintain user groups and assign proper permissions to individual folders on the Linux server they use. For the folder slides, David and Carl update files (e. g., lec1.pdf, lec2.pdf) and the files are open to all students. For the folder project, Alice and Bob can only upload their own file (e. g, Alice. tar. gz, Bob. tar. gz) but not download any files here. In the meantime, they are allowed to list the files in this folder to confirm if they have submitted or not as well as the timestamp, but they are not allowed to write or create files in this folder. Thus, they will use the provided turnin program to submit. I am confused that how to find the proper user groups, user in the groups, how to find permission, and logic. I have tried but its too confusing for me. Help would be grateful thanks.