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He said that for the most part he simply sent print jobs using the Line Printer Daemon ( LPD ) , the Internet Printing Protocol ( IPP ) and the RAW protocol on communications port 9100 to printers that did n't require authentication .
 He: discoverer; printers: vulnerable system; the Line Printer Daemon ( LPD ): vulnerable system; the Internet Printing Protocol ( IPP ): vulnerable system; RAW protocol: vulnerable system
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: discover vulnerability 
  Option: vulnerable system owner, vulnerability, capabilities, time, vulnerable system version, discoverer, common vulnerabilities and exposures, supported platform, vulnerable system 
Text: {0} 
Answer:
 He: discoverer; printers: vulnerable system; the Line Printer Daemon ( LPD ): vulnerable system; the Internet Printing Protocol ( IPP ): vulnerable system; RAW protocol: vulnerable system