Utilize the input text as a context reference, choose the right relationship between 'Nintendo' and 'Satoru Iwata' from the options.
Options: business division, subsidiary, operator, chief executive officer

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.
chief executive officer