Apex domains cannot have CNAME records.
Question and response
Question
dig marketing. NS
Answer
marketing. 5 NS v0n0.nic.marketing.
marketing. 5 NS v2n1.nic.marketing.
marketing. 5 NS v2n0.nic.marketing.
marketing. 5 NS v0n3.nic.marketing.
marketing. 5 NS v0n2.nic.marketing.
marketing. 5 NS v0n1.nic.marketing.
Authority
The response has no authority records.
Additional
v0n0.nic.marketing. 67144 A 65.22.20.6
v0n1.nic.marketing. 58995 A 65.22.21.6
v0n2.nic.marketing. 58995 A 65.22.22.6
v0n3.nic.marketing. 67144 A 161.232.10.6
v2n0.nic.marketing. 67144 A 65.22.23.6
v2n1.nic.marketing. 58995 A 161.232.11.6
v0n0.nic.marketing. 67144 AAAA 2a01:8840:16:0:0:0:0:6
v0n1.nic.marketing. 58995 AAAA 2a01:8840:17:0:0:0:0:6
v0n2.nic.marketing. 58995 AAAA 2a01:8840:18:0:0:0:0:6
v0n3.nic.marketing. 67144 AAAA 2a01:8840:f4:0:0:0:0:6
v2n0.nic.marketing. 67144 AAAA 2a01:8840:19:0:0:0:0:6
v2n1.nic.marketing. 58995 AAAA 2a01:8840:f5:0:0:0:0:6
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0