Your network contains an Active Directory domain named contoso.com. The domain contains five domain controllers.
You purchase Microsoft 365 and plan to implement several Microsoft 365 services.
You need to identify an authentication strategy for the planned Microsoft 365 deployment. The solution must meet the following requirements:
Ensure that users can access Microsoft 365 by using their on-premises credentials.

Use the existing server infrastructure only.

Store all user passwords on-premises only.

Be highly available.

Which authentication strategy should you identify?