Synchronizing an AD DS (Active Directory Domain Services) environment with Azure AD (Azure Active Directory) will help you in establishing consistent user logins to allow the users to use the same credentials to access their resources in AVD (Azure Virtual Desktop) and other Microsoft cloud services. 
Which of the following are available synchronization options? (Select all that are applicable)

Answer options:

A.Password Hash Sync
B.Pass-through Authentication
C.Pass-forward Authentication
D.Windows Hello for Business
E.All the above

Correct Answers: A and B 
The various available synchronization methods are: 
Password Hash Sync: This method synchronizes usernames and hashes of passwords with Azure AD. 
Pass-through Authentication: This authentication option allows your on-premises directory service to perform simple authentication for Microsoft cloud services, requiring very little on-premises configuration. 
Active Directory Federation Services: This is a more complex partner federation, RSA tokens, and Smart Card authentication option. With this option, you need to provision extra on-premises servers and ensure their availability.
Option A is correct. Password Hash Sync is a valid synchronization method.
Option B is correct. Pass-through Authentication is a valid available authentication method.
Option C is incorrect. Pass-forward Authentication is not a valid authentication method.
Option D is incorrect. Windows Hello for Business isn`t a synchronization option for Azure Active Directory. Its value is highly based on PIN and biometric logins using asymmetrical public-private key pairs (PKI) instead of a shared secret, such as a password.
Option E is incorrect. Pass-forward Authentication and Windows Hello for Business are not valid synchronization options.
Reference: 
To know more about how to migrate from federation to cloud authentication, please visit the below-given link: 

https://docs.microsoft.com/en-us/azure/active-directory/hybrid/migrate-from-federation-to-cloud-authentication