Apex domains cannot have CNAME records.
Question and response
Question
dig d11z4y4smpr7pp.cloudfront.net. NS
Answer
d11z4y4smpr7pp.cloudfront.net. 5 NS ns-1909.awsdns-46.co.uk.
d11z4y4smpr7pp.cloudfront.net. 5 NS ns-1117.awsdns-11.org.
d11z4y4smpr7pp.cloudfront.net. 5 NS ns-12.awsdns-01.com.
d11z4y4smpr7pp.cloudfront.net. 5 NS ns-825.awsdns-39.net.
Authority
The response has no authority records.
Additional
ns-12.awsdns-01.com. 1 A 205.251.192.12
ns-825.awsdns-39.net. 1 A 205.251.195.57
ns-1117.awsdns-11.org. 1 A 205.251.196.93
ns-1909.awsdns-46.co.uk. 1 A 205.251.199.117
ns-12.awsdns-01.com. 1 AAAA 2600:9000:5300:c00:0:0:0:1
ns-825.awsdns-39.net. 1 AAAA 2600:9000:5303:3900:0:0:0:1
ns-1117.awsdns-11.org. 1 AAAA 2600:9000:5304:5d00:0:0:0:1
ns-1909.awsdns-46.co.uk. 1 AAAA 2600:9000:5307:7500:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0