A user tries to ftp a 3 gigabyte file to an AIX machine at certain times during the day.  The file transfer fails at exactly 2,147,483,584 bytes each time.  All of the following are probable causes of the failures EXCEPT:（）

• A、AIX has not been updated to V4
• B、fsize in /etc/security/limits file has not been set to -1
• C、ftp can only transfer files > 2 gig in binary mode
• D、The filesystem is not large-file enabled