[dns-operations] question on query to DNS server's IPv6 interface

[Tessa Plum]

Hello

Sorry I am newbie to DNS.

When making a DNS query (giving the type is A) to an authorized 
nameserver to its IPv6 address, will the value in answer are also IPv6 
addresses? If the host doesn't have an IPv6 address, how will DNS server 
return?

Thank you.

Tessa.