You are developing a Windows Store app.
The app must provide single sign-on (SSO) to a Microsoft account and to social networks. The SSO feature must be accessible from any device.
You need to implement SSO.
Which authentication strategy should you use?

A.
Account settings

B.
Smart card authentication

C.
Fingerprint authentication

D.
Web authentication broker

Explanation:
Understanding and debugging the web authentication broker workflow (XAML) (Windows)