Which of the following is the BEST reason for not storing database files in the /var directory?

A user cannot write files to the /home/user directory. The junior Linux administrator runs the following commands:

Which of the following BEST represents why the user cannot write files?

Ann, a junior Linux administrator, needs to copy software from her local machine to assist in developing a software application on a remote machine with the IP address 192.168.3.22. The file needs to be placed on the /tmp directory. After downloading the RPM to the local machine, which of the following commands would be BEST to use to copy the software?

A systems administrator has retrieved the latest copy of the system backup files, which had been stored offsite at a third-party vendor. The systems administrator wants to validate that the data was not modified since the backup.
Which of the following would BEST verify that the data remained the same?

A systems administrator logs into a Linux server and must identify whether the server is a physical or virtual machine.
Which of the following commands should the administrator run?