Apex domains cannot have CNAME records.
Question and response
Question
dig stisc.md. NS
Answer
stisc.md. 5 NS ns.dns.md.
stisc.md. 5 NS ns.gov.md.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0