Which of the following is an example of Personally Identifiable Information (PII)?

The choice of a driver's license number as an example of Personally Identifiable Information (PII) is accurate because it uniquely identifies an individual and can be used to track, access, or infer additional personal information about them. PII is defined as any data that could potentially identify a specific individual, and a driver's license number is a widely recognized identifier that includes personal data linked to identity, such as an individual's name, address, and date of birth.

While other options like an email address also qualify as PII because they can identify a person, a driver's license number is often considered more sensitive and is subject to stricter protections under various privacy laws since it is directly associated with government-issued identification. The company registration number, on the other hand, pertains to a business entity rather than an individual, and public social media profiles, while they contain identifiable information, may not always qualify as PII depending on how much personal information is shared and whether it is publicly accessible without requiring additional context to identify an individual. Thus, the driver's license number stands out as a quintessential example of PII.