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.
Take context from the input text and decide on the accurate relationship between 'Satya Nadella' and 'Microsoft' from the options provided.
Options: parent organization, business division, chairperson, employer