Take context from the input text and decide on the accurate relationship between 'Vikram Pandit' and 'Citigroup' from the options provided.
Options: employer, owner of, product/material produced, brand

Last week, Citigroup Inc's ( C.N ) Chief Executive Vikram Pandit said that he, Chairman Win Bischoff, and senior adviser Robert Rubin would not receive bonuses for 2008.
employer