Denis wants to classify his organization's data using common labels: private, sensitive, public, and proprietary. Which of the following should he apply to his highest classification level based on common industry practices?

Common practice makes proprietary or confidential data the most sensitive data. Private data is internal business data that shouldn't be exposed but that doesn't meet the threshold for confidential or proprietary data. Sensitive data may help attackers or otherwise create risk and typically refers to any information that isn't public or unclassified, and public data is just that—data that is or can be made public.