You have a Microsoft 365 subscription.
You need to implement a passwordless authentication solution that supports the following device types:
• Windows
• Android
• iOS
The solution must use the same authentication method for all devices.
Which authentication method should you use?
To implement a passwordless authentication solution that supports Windows, Android, and iOS devices with the same authentication method for all devices, FIDO2-compliant security keys are the appropriate choice. These keys are compatible across all mentioned platforms and offer a secure, universal standard for authentication. Other options, like the Microsoft Authentication app or Windows Hello for Business, do not provide the same cross-platform support, particularly for Windows desktops.
https://www.examtopics.com/discussions/microsoft/view/81291-exam-ms-100-topic-5-question-73-discussion/
I agree to use Answer A. For the named platforms it must be authenticator app.
But you can't use the Authenticator app on Windows. The questions states that all devices must be supported. You can a FIDO2 USB device if you want to log in on all the devices in a Office app (such as Outlook Mobile).
I don't believe fido2 keys are supported on iOS and Android
Copilot: Yes, FIDO2-compliant security keys are supported on both Android and iOS devices. Many security keys, such as the YubiKey 5 NFC, offer NFC (Near Field Communication) capabilities, making them compatible with mobile devices
I think B is correct since there is no Authenticator app for Windows and the question states that the same method must be used on all platforms.
no Authenticator on Windows
Chat gpt says b
https://learn.microsoft.com/en-us/entra/identity/authentication/concept-authentication-passwordless#fido2-security-keys
As stated by others, no Authenticator on Windows, hence B