When opening a file in writing mode using the FTP handler what must be done so that the file will still be written to the server in the event it previously exists? Options: a) Provide a context for fopen() using stream_context_create(). b) You must delete the file first before uploading a new file. c) Configure this behavior in the php.ini file using the ftp.overwrite directive. d) Open the file using the 'w+' mode.
