Apex domains cannot have CNAME records.
Question and response
Question
dig gov.md. NS
Answer
gov.md. 5 NS nsx.gov.md.
gov.md. 5 NS nsy.gov.md.
Authority
The response has no authority records.
Additional
nsx.gov.md. 5 A 192.174.68.26
nsy.gov.md. 5 A 176.97.158.26
nsx.gov.md. 5 AAAA 2001:67c:1bc:0:0:0:0:26
nsy.gov.md. 5 AAAA 2001:67c:10b8:0:0:0:0:26
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0