Your network contains an Active Directory forest. The forest contains a single domain named contoso.com. The domain contains four domain controllers named DC1, DC2, DC3, and DC4.
DC1 is a Domain Naming Master, Schemda Master, and Global catalog server.
DC2 is a PDC emulator and Global catalog server
DC3 is the Infrastructure Master
DC4 is the RID Master, and Global catalog server
You plan to deploy a new domain controller named DC5 in the contoso.com domain. You need to identify which domain controllers must be online to ensure DC5 can be promoted successfully to a domain controller. Which domain controller should you identify?
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