Utilize the input text as a context reference, choose the right relationship between 'Sheryl Sandberg' and 'Facebook' from the options.
Options: member of, distribution format, employer, director/manager

SAN FRANCISCO, July 6 (Reuters) - Facebook Inc's Chief Operating Officer Sheryl Sandberg is taking a seat on the board of SurveyMonkey, the online polling company that was run by her late husband, Dave Goldberg.
employer