Apex domains cannot have CNAME records.
Question and response
Question
dig novamedia.com. NS
Answer
novamedia.com. 4 NS ns-2018.awsdns-60.co.uk.
novamedia.com. 4 NS ns-1205.awsdns-22.org.
novamedia.com. 4 NS ns-239.awsdns-29.com.
novamedia.com. 4 NS ns-619.awsdns-13.net.
Authority
The response has no authority records.
Additional
ns-619.awsdns-13.net. 1 A 205.251.194.107
ns-1205.awsdns-22.org. 1 A 205.251.196.181
ns-2018.awsdns-60.co.uk. 1 A 205.251.199.226
ns-239.awsdns-29.com. 1 AAAA 2600:9000:5300:ef00:0:0:0:1
ns-619.awsdns-13.net. 1 AAAA 2600:9000:5302:6b00:0:0:0:1
ns-1205.awsdns-22.org. 1 AAAA 2600:9000:5304:b500:0:0:0:1
ns-2018.awsdns-60.co.uk. 1 AAAA 2600:9000:5307:e200:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0