What is the relationship between 'iShares' and 'BlackRock' in the context of the input sentence.
Options: original broadcaster, manufacturer, chief executive officer, operator

BlackRock generated a record $17 billion in sustainable iShares ETFs inflows year-to-date, outpacing the $12 billion from all of 2019 as we innovate and expand innovate and expand innovate and expand access to sustainable investment solutions.
operator