For which domain or domains does the default cache-only nameserver have a list of authoritative…

For which domain or domains does the default cache-only nameserver have a list of authoritative servers in the /var/named/named. ca file?

A.
the domain to which the cache only nameserver belongs

B.
the root domain

C.
the domains to which the local DHCP servers belong

D.
the domains to which the local DNS servers belong