Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-02.com. NS
Answer
awsdns-02.com. 5 NS g-ns-1730.awsdns-02.com.
awsdns-02.com. 5 NS g-ns-3.awsdns-02.com.
awsdns-02.com. 5 NS g-ns-578.awsdns-02.com.
awsdns-02.com. 5 NS g-ns-1154.awsdns-02.com.
Authority
The response has no authority records.
Additional
g-ns-3.awsdns-02.com. 5 A 205.251.192.3
g-ns-578.awsdns-02.com. 5 A 205.251.194.66
g-ns-1154.awsdns-02.com. 5 A 205.251.196.130
g-ns-1730.awsdns-02.com. 5 A 205.251.198.194
g-ns-3.awsdns-02.com. 5 AAAA 2600:9000:5300:300:0:0:0:1
g-ns-578.awsdns-02.com. 5 AAAA 2600:9000:5302:4200:0:0:0:1
g-ns-1154.awsdns-02.com. 5 AAAA 2600:9000:5304:8200:0:0:0:1
g-ns-1730.awsdns-02.com. 5 AAAA 2600:9000:5306:c200:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0