You are a network administrator for a company that has an Office 365 E3 subscription. You purchase Enterprise Mobility S

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You are a network administrator for a company that has an Office 365 E3 subscription. You purchase Enterprise Mobility Suite licenses. You implement synchronization by using a federated identity model.
Passwords for Sales team users often expire while they are travelling. When this happens, the users are not able to log on to the virtual private network (VPN) to perform their duties. Users must be able to reset their own passwords.
You need to enable password write-back.
Which application should you configure?

A. Web Application Proxy
B. Active Directory Federation Services (AD FS)
C. Microsoft Online Services Sign-in Assistant
D. Directory Synchronization (DirSync)
E. Azure Active Directory Connect