Apex domains cannot have CNAME records.
Question and response
Question
dig trecom.org. NS
Answer
trecom.org. 5 NS ns-1884.awsdns-43.co.uk.
trecom.org. 5 NS ns-417.awsdns-52.com.
trecom.org. 5 NS ns-426.awsdns-53.com.
trecom.org. 5 NS ns-1144.awsdns-15.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0