Apex domains cannot have CNAME records.
Question and response
Question
dig brightidea.com. NS
Answer
brightidea.com. 5 NS ns-1074.awsdns-06.org.
brightidea.com. 5 NS ns-647.awsdns-16.net.
brightidea.com. 5 NS ns-500.awsdns-62.com.
brightidea.com. 5 NS ns-1832.awsdns-37.co.uk.
Authority
The response has no authority records.
Additional
ns-647.awsdns-16.net. 4 A 205.251.194.135
ns-1074.awsdns-06.org. 4 A 205.251.196.50
ns-1832.awsdns-37.co.uk. 4 A 205.251.199.40
ns-500.awsdns-62.com. 4 AAAA 2600:9000:5301:f400:0:0:0:1
ns-647.awsdns-16.net. 4 AAAA 2600:9000:5302:8700:0:0:0:1
ns-1074.awsdns-06.org. 4 AAAA 2600:9000:5304:3200:0:0:0:1
ns-1832.awsdns-37.co.uk. 4 AAAA 2600:9000:5307:2800:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0