An administrator is uncomfortable allowing users to log in as root. Which of the following ensures that root logins are disallowed?

Which of the following would be the BEST solution for a systems administrator to access the graphical user environment of a Linux machine remotely?

Users in the sales department are unable to create new files in the shared directory /Sales. A junior Linux administrator determines the permissions on the /Sales directory are set to rwxr-----, and sales is the group owner of the directory.
Which of the following is the BEST command for the junior administrator to issue to allow the users to create new files?

A Linux administrator looks at the /etc/timezone file and determines the need to change the time zone from California to New York temporarily. Which of the following commands will accomplish this?

An issue was discovered on a testing branch of a Git repository. A file was inadvertently modified and needs to be reverted to the master branch version. Which of the following is the BEST option to resolve the issue?