Apex domains cannot have CNAME records.
Question and response
Question
dig jivetango.com. NS
Answer
jivetango.com. 5 NS ns-2003.awsdns-58.co.uk.
jivetango.com. 5 NS ns-75.awsdns-09.com.
jivetango.com. 5 NS ns-348.awsdns-43.com.
jivetango.com. 5 NS ns-1282.awsdns-32.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0