On: YubiKey 4C

[bogle]

Wouldn't that make it 3FA? I'd need my password, my physical key and my fingerprints?

[JumpCrisscross → bogle]

One could then argue the Google Authenticator app running on my iPhone is 3FA, as one needs to be able to unlock my iPhone to access it.

[falcor84 → JumpCrisscross]

I would definitely argue that it's 3FA.

* Something you know - the service's password

* Something you have - the phone with the authenticator

* Something you are - your fingerprint

EDITED - formatting