A system administrator has just finished upgrading a system to AIX 5.2. If there are future problems， the system administrator would like to add an entry to the AIX errorlog to record this event. Which of the following commands can be issued for this purpose？（）

• A、/usr/bin/errmsg "System upgraded to AIX 5.2"
• B、/usr/bin/errlog "System upgraded to AIX 5.2"
• C、/usr/bin/errupdate "System upgraded to AIX 5.2"
• D、/usr/bin/errlogger "System upgraded to AIX 5.2"