Apex domains cannot have CNAME records.
Question and response
Question
dig opticstrade.com. NS
Answer
opticstrade.com. 5 NS penza.ens.mail.ru.
opticstrade.com. 5 NS derbent.ens.mail.ru.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0