Utilize the input text as a context reference, choose the right relationship between 'Tatsumi Kimishima' and 'Nintendo' from the options.
Options: chief executive officer, platform, employer, distribution format

TOKYO, Sept 14 (Reuters) - Japanese videogame maker Nintendo Co Ltd said on Monday it was promoting Managing Director Tatsumi Kimishima to replace former President Satoru Iwata who died of cancer in July.
employer