You have deployed Azure AD$,$ installed Azure AD Connect, and configured synchronization. However, some users are complaining that they can no longer sign in to the on$-$premises Active Directory after changing their password in the cloud. They are able to sign in to the Azure cloud, however. What should you do$?$

a$.$ Configure SSPR$.$

b$.$ Use Azure AD Connect sync$.$

c$.$ Configure password writeback.

d$.$ Disable password hash sync$.$