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A coalition of some of the globe ’s top researchers and cryptographers are pleading with The Guardian to retract a story it published last week in which it suggested the encrypted messaging app WhatsApp contained a backdoor .
 it: discoverer; the encrypted messaging app WhatsApp: vulnerable system; a backdoor: vulnerability
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:
 it: discoverer; the encrypted messaging app WhatsApp: vulnerable system; a backdoor: vulnerability