Apex domains cannot have CNAME records.
Question and response
Question
dig intellex.rs. NS
Answer
intellex.rs. 5 NS rsns2.dwhost.net.
intellex.rs. 5 NS rsns1.dwhost.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0