It is generally undesirable to have conflicts, such as different IP addresses to map to the same name or different organizations claiming the same domain name. Such conflicts are prevented by assigning responsibilities to different parties that act in a coordinated way. Check all of the entities mentioned below that help maintain the correctness of the DNS database.

a. IANA is an international organization that is responsible for coordinating assignment of IP addresses and domains. It authorizes

b. Registrars to handle top-level domains. Registrars are responsible for registering domains (within their top level domain) to organizations, and for storing Resource Records that map each registered organization domain to the the authoritative name server of that domain.

c. Authoritative name servers are responsible for names and addresses within their own organization's registered domain.

d. Laws and Courts: if anyone tries to claim a domain name or IP address they are not entitled to, the registrars's typical action is to take that person or organization to court.