Apex domains cannot have CNAME records.
Question and response
Question
dig tellurian.com. NS
Answer
tellurian.com. 5 NS ns2.tellurian.net.
tellurian.com. 5 NS ns1.tellurian.net.
Authority
The response has no authority records.
Additional
ns1.tellurian.net. 5 A 69.172.135.51
ns2.tellurian.net. 5 A 69.172.138.238
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0