In a hybrid identity model, what can you use to sync identities between Active Directory Domain Serv

In a hybrid identity model, what can you use to sync identities between Active Directory Domain Services (AD DS) and Azure Active Directory (Azure AD)?

A. Active Directory Federation Services (AD FS)

B. Azure Sentinel

C. Azure AD Connect

D. Azure Ad Privileged Identity Management (PIM)

Reference:
https://docs.microsoft.com/en-us/azure/active-directory/hybrid/whatis-azure-ad-connect