Apex domains cannot have CNAME records.
Question and response
Question
dig dominos.com. NS
Answer
dominos.com. 5 NS a1-66.akam.net.
dominos.com. 5 NS a10-65.akam.net.
dominos.com. 5 NS a8-65.akam.net.
dominos.com. 5 NS a2-64.akam.net.
dominos.com. 5 NS a11-66.akam.net.
dominos.com. 5 NS a13-67.akam.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0