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.
In the context of the input sentence, determine the relationship between 'Satya Nadella' and 'Microsoft'.
Options: employer, business division, chairperson, parent organization