Apex domains cannot have CNAME records.
Question and response
Question
dig grafinell.com. NS
Answer
grafinell.com. 5 NS ns1.grafinell.com.
grafinell.com. 5 NS ns2.grafinell.com.
Authority
The response has no authority records.
Additional
ns1.grafinell.com. 5 A 104.140.76.66
ns2.grafinell.com. 5 A 50.2.99.94
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0