Which option provides stronger authentication?

• A. Keyless entry locks
• B. Strong passwords
• C. Multiple factors
• D. Handprint geometry

Answer: (C)

Combining more than one credential from different categories makes authentication much stronger. When you use multiple factors, an attacker must compromise at least two independent pieces of evidence—such as something you know (a password) and something you have (a code from a device or app), or something you are (a biometric) plus another factor. This significantly raises the bar because compromising one factor (like stealing a password) isn’t enough to gain access.

Single-factor options—like a strong password (something you know) or a biometric (something you are)—provide good protection, but they rely on just one type of credential. A keyless entry device can also be a single factor, depending on its setup, so it doesn’t inherently guarantee the same level of protection as using two different factors.

That’s why using multiple factors offers the strongest authentication: it requires more than one line of defense and uses different forms of evidence to verify identity.