What is the relationship between 'PepsiCo' and 'Indra Nooyi' in the context of the input sentence.
Options: publisher, employer, chief executive officer, headquarters location

The soda recently ditched the artificial sweetener aspartame for sucralose (or Splenda), but some longtime connoisseurs are saying it has a “nasty aftertaste” and is “unpalatable.” PepsiCo Chief Executive Indra Nooyi said it would take a few cycles to see the effect of the change.
chief executive officer