Final answer:
Authenticating would not be classified as identity theft, while phishing and skimming are forms of identity theft.
Step-by-step explanation:
Identity theft refers to the unauthorized use of someone's personal information for fraudulent purposes. Out of the provided options, authenticating would not be classified as identity theft. Authenticating involves verifying the identity of a person or the integrity of data and systems, whereas phishing and skimming are both forms of identity theft.
Learn more about Identifying forms of identity theft