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® In a follow - up statement , WhatsApp denied accusations that it had inserted what amounted to a backdoor in its messaging code : The Guardian posted a story this morning claiming that an intentional design decision in WhatsApp that prevents people from losing millions of messages is a “ backdoor ” allowing governments to force WhatsApp to decrypt message streams .
 The Guardian: discoverer; this morning: time
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:
 The Guardian: discoverer; this morning: time