CompTIA Security+ (SY0-601) — Question 848

Which of the following can work as an authentication method and as an alerting mechanism for unauthorized access attempts?

Answer options

• A. Smart card
• B. Push notifications
• C. Attestation service
• D. HMAC-based
• E. one-time password

Correct answer: B

Explanation

Push notifications can inform users of unauthorized access attempts while also serving as a method for authentication by sending alerts that require user action. The other options primarily focus on authentication without providing a mechanism for real-time alerts about access attempts.