Apex domains cannot have CNAME records.
Question and response
Question
dig setardsl.aw. NS
Answer
setardsl.aw. 4 NS ns1.setarnet.aw.
setardsl.aw. 4 NS ns2.setarnet.aw.
Authority
The response has no authority records.
Additional
ns1.SETARNET.AW. 4 A 186.189.1.29
ns2.SETARNET.AW. 4 A 186.189.63.29
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0