Utilize the input text as a context reference, choose the right relationship between 'Thomson Reuters' and 'software' from the options.
Options: stock exchange, product/material produced, employer, chairperson

Symantec Corp, the antivirus and security software maker best known for its Norton antivirus software, is expected to report first-quarter earnings slightly below analysts' expectations on Tuesday, according to Thomson Reuters I/B/E/S.
product/material produced