CORRECT TEXT
To exclude all log messages of a given logging facility, you should use a logging priority of:

Answer: none

Explanation:
You can see on /etc/syslog.conf configuration file to store the log messages about the proper
facility. The pattern is facility.priority, Example
mail.* à it means mail related all priority. If you want to exclude all log messages of facility use
none priority. Eg. cron.none