Seated with Obama and Xi at the head table were Apple (AAPL.O) CEO Tim Cook, Satya Nadella of Microsoft (MSFT.O), Facebook's (FB.O) Mark Zuckerberg and Salesforce.com's (CRM.N) Marc Benioff.
Refer to the input text as context and select the correct relationship between 'Satya Nadella' and 'Microsoft' from the available options.
Options: business division, parent organization, chairperson, employer