You develop a Windows Store application that has a web service backend. You plan to use the
Azure Active Directory Authentication Library to authenticate users to Azure Active Directory (Azure
AD) and access directory data on behalf of the user. You need to ensure that users can log in to
the application by using their Azure AD credentials. Which two actions should you perform? Each
correct answer presents part of the solution.

A.
Create a native client application in Azure AD.

B.
Configure directory integration.

C.
Create a web application in Azure AD.

D.
Enable workspace join.

E.
Configure an Access Control namespace.

Explanation:
B: An application that wants to outsource authentication to Azure AD must be registered in Azure
AD, which registers and uniquely identifies the app in the directory
C (not A): NativeClient-WindowsStore
A Windows Store application that calls a web API that is secured with Azure AD

Authentication Scenarios for Azure AD, Basics of Authentication in Azure AD
http://msdn.microsoft.com/en-us/library/azure/dn499820.aspx#BKMK_Auth
https://github.com/AzureADSamples/NativeClient-WindowsStore