Which of the following commands sets all the directories' permissions recursively in the user's home directory and as accessible only to the user?

Which of the following is the location for built-in Linux executable files and utilities?

A Linux administrator notices that an application is having trouble connecting to an external database. Which of the following commands should the administrator use to validate the connection to the remote port exposed by a database server?

A systems administrator is creating a backup copy of the /home/directory. Which of the following commands allows the administrator to archive and compress the directory at the same time?

Which of the following is a characteristic of Python 3?