Apex domains cannot have CNAME records.
Question and response
Question
dig dds.ro. NS
Answer
dds.ro. 5 NS b.dds.ro.
dds.ro. 5 NS a.dds.ro.
Authority
The response has no authority records.
Additional
a.dds.ro. 5 A 188.40.246.97
b.dds.ro. 5 A 188.40.246.99
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0