Authenticator apps (e.g., Microsoft Authenticator, Google Authenticator, Duo) often support push notifications. When the user logs in, the app sends a push to their mobile device, prompting the user to approve or deny the authentication request — a common and user-friendly form of multi-factor authentication (MFA).
A. Phone call verification is a separate method involving voice-based confirmation.
C. Hardware tokens generate one-time codes but do not send push notifications.
D. SMS sends a text message with a code — again, no push mechanism.
[Reference:, CompTIA A+ 220-1102 Objective 2.2: Compare and contrast multi-factor authentication methods., Study Guide Section: Authentication apps and push notification verification, ===========================, , ]
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