Apex domains cannot have CNAME records.
Question and response
Question
dig solvinity.com. NS
Answer
solvinity.com. 5 NS a1-167.akam.net.
solvinity.com. 5 NS a5-67.akam.net.
solvinity.com. 5 NS a3-64.akam.net.
solvinity.com. 5 NS a26-64.akam.net.
solvinity.com. 5 NS a12-65.akam.net.
solvinity.com. 5 NS a10-67.akam.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0