Apex domains cannot have CNAME records.
Question and response
Question
dig kltt.org. NS
Answer
kltt.org. 2 NS ns-946.awsdns-54.net.
kltt.org. 2 NS ns-920.awsdns-51.net.
kltt.org. 2 NS ns-1934.awsdns-49.co.uk.
kltt.org. 2 NS ns-1901.awsdns-45.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0