Apex domains cannot have CNAME records.
Question and response
Question
dig rabbitlaboratory.com. NS
Answer
rabbitlaboratory.com. 5 NS ns-1273.awsdns-31.org.
rabbitlaboratory.com. 5 NS ns-1151.awsdns-15.org.
rabbitlaboratory.com. 5 NS ns-262.awsdns-32.com.
rabbitlaboratory.com. 5 NS ns-1866.awsdns-41.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0