What are the operational roles for DC (Domain controller) and ADC ( Additional Domain Controller)?

Within a computer network domain, a domain controller (DC) is a server computer that responds to security authentication requests. It authenticates users, saves account information, and enforces a domain's security policy.
An extra domain controller (ADC) is a domain controller that exists in a given environment (DC, CDC, and GCDC). It functions similarly to a backup Domain Controller in that if the primary Domain Controller fails, the Additional Domain Controller (ADC) will assist in maintaining network stability.
DC (Domain controller) has the following operational roles:
Master Schema for Domain Naming Infrastructure Master RID Master PDC Emulator Master RID Master RID Master RID Master RID Master RID Master RID Master
The ADC (Additional Domain Controller) has the following operational roles:
RID Master Infrastructure Master PDC Emulator

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