The correct answer is: User accounts passwords and other attributes.

Azure AD Connect Express config synchronizes on premises user objects along with their attributes and it enables password hash synchronization by default so users can sign in to Azure AD with the same credentials. The express installation applies common default sync rules and settings to keep the on premises Active Directory synchronized with Azure AD without additional configuration.

Additional user attributes is incorrect because the express configuration does more than just sync extra attributes. It synchronizes the user accounts themselves and their password hashes as well as common attributes.

User accounts is incorrect because that option omits the fact that passwords and other user attributes are also synchronized by the express setup. Syncing only account objects would not reflect the full behavior of the express configuration.

Passwords and credential hashes is incorrect because the express configuration does not only synchronize credential data. It synchronizes user accounts and their attributes in addition to performing password hash synchronization, and the option wording is incomplete and misleading.

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