Apex domains cannot have CNAME records.
Question and response
Question
dig tarquinio.info. NS
Answer
tarquinio.info. 5 NS ns2.tarquinio.info.
tarquinio.info. 5 NS ns1.tarquinio.info.
Authority
The response has no authority records.
Additional
ns1.tarquinio.info. 5 A 157.254.12.81
ns2.tarquinio.info. 5 A 74.48.155.108
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0