Which authentication approach is described by Steve's walking-pattern system paired with RFID badges?

• A. Single-factor authentication
• B. Passwordless authentication
• C. Two-factor authentication using walking patterns and RFID badges
• D. Biometric authentication based on walking speed

Answer: (C)

Two-factor authentication is being demonstrated here. It combines two independent factors from different categories: a biometric/behavioral factor (the walking pattern) and a possession factor (the RFID badge). Access is granted only when both are present, which provides stronger security than using a single factor. It isn’t single-factor, since two distinct factors are required. It isn’t passwordless, because a physical badge is still involved. And while walking can be a biometric element, the requirement of the badge means it’s not just a biometric check.