Apex domains cannot have CNAME records.
Question and response
Question
dig nic.host. NS
Answer
nic.host. 5 NS ns03.trs-dns.com.
nic.host. 5 NS ns03.trs-dns.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0