Which of the following contains a tree of domain names?

Which of the following contains a tree of domain names?

A.
Domain name space

B.
Domain name formulation

C.
Domain Name System

D.
Authoritative name server

Explanation:
Domain name space consists of a tree of domain names. Each node or leaf in the tree has zero or
more resource records, which hold information associated with the domain name. The tree subdivides into zones starting at the root zone.
RFC 1035, RFC 1123, and RFC 2181. A domain name consists of one or more parts, technically called
labels that are conventionally concatenated, and delimited by dots.

computers, services, or other resources connected to the Internet or a private network. It associates
various information with domain names assigned to each of the participants.
been configured by an original source, for example, the domain administrator or by dynamic DNS
methods, in contrast to the answers that were obtained via a regular DNS query to one more name
server. An authoritative-only name server only returns answers to the queries about domain names
that have been specifically configured by the administrator.