Which command is used to set restrictions on the size of a core file that is created for a user when a program crashes?

When trying to unmount a device it is reported as being busy. Which of the following commands could be used to
determine which process is causing this?

Which configuration file would be edited to change default options for the OpenSSH server?

Which of the following find commands will print out a list of files owned by root and with the SUID bit set in /usr?

Which directory holds the files that configure the xinetd service when using several configuration files instead of an
integrated configuration file? (Specify the full path to the directory.)

Which file lists which users can execute commands using sudo? (Specify the full name of the file, including path.)

Which file contains a set of services and hosts that will be allowed to connect to the server by going through a TCP
Wrapper program such as tcpd? (Specify the full name of the file, including
path.)https://lh3.googleusercontent.com/-5cd-clmKnbk/AAAAAAAAAAI/AAAAAAAAADM/-SXesH19Ido/s46-c-k-no/photo.jpg

Which of the following commands preloads and manages keys that are used for automatic authentication while logging in to
other machines using SSH?

What is a purpose of an SSH host key?

Which of the following commands can be used to limit the amount of memory a user may use?