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The discovery was made by security researchers at MacKeeper who said that they had found gigabytes of files on an internet - connected backup drive that was not password - protected : The most shocking document was a spreadsheet of open investigations that included the name , rank , location , and a detailed description of the accusations .
 security researchers: discoverer; MacKeeper: discoverer
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:
 security researchers: discoverer; MacKeeper: discoverer