Which of the following words is used to restrict the records that are returned from a SELECT query based on a supplied criteria for the values in the records?

When generating new authentication keys with SSH for a user, where should the private key be kept?

How can the existing environment variable FOOBAR be suppressed for the execution of the script./myscript only?

With X11 forwarding in ssh, what environment variable is automatically set in the remote host shell that is not set when X11 forwarding is not enabled? (Specify only the environment variable without any additional commands or values.)

In case neither cron.allow nor cron.deny exist in /etc/, which of the following is true?