Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-07.org. NS
Answer
awsdns-07.org. 5 NS g-ns-713.awsdns-07.org.
awsdns-07.org. 5 NS g-ns-135.awsdns-07.org.
awsdns-07.org. 5 NS g-ns-1607.awsdns-07.org.
awsdns-07.org. 5 NS g-ns-1034.awsdns-07.org.
Authority
The response has no authority records.
Additional
g-ns-135.awsdns-07.org. 5 A 205.251.192.135
g-ns-713.awsdns-07.org. 5 A 205.251.194.201
g-ns-1034.awsdns-07.org. 5 A 205.251.196.10
g-ns-1607.awsdns-07.org. 5 A 205.251.198.71
g-ns-135.awsdns-07.org. 5 AAAA 2600:9000:5300:8700:0:0:0:1
g-ns-713.awsdns-07.org. 5 AAAA 2600:9000:5302:c900:0:0:0:1
g-ns-1034.awsdns-07.org. 5 AAAA 2600:9000:5304:a00:0:0:0:1
g-ns-1607.awsdns-07.org. 5 AAAA 2600:9000:5306:4700:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0