Final answer:
Examples of personally identifiable information (PII) include social security numbers and public email addresses.
Step-by-step explanation:
The personally identifiable information (PII) examples from the given options are:
- Social Security Number: It is a unique nine-digit number assigned to individuals by the US government for social security purposes. It is highly sensitive personal information.
- Public Email Address: While it may not directly reveal a person's identity, it can still be considered PII because it can be linked to an individual's online activity and communications.
An anonymous username and historical data are not examples of personally identifiable information.