Apex domains cannot have CNAME records.
Question and response
Question
dig bitrix.info. NS
Answer
bitrix.info. 5 NS ns-1086.awsdns-07.org.
bitrix.info. 5 NS ns-356.awsdns-44.com.
bitrix.info. 5 NS ns-682.awsdns-21.net.
bitrix.info. 5 NS ns-1979.awsdns-55.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0