Apex domains cannot have CNAME records.
Question and response
Question
dig citc.gov.sa. NS
Answer
citc.gov.sa. 5 NS ns1.citc.gov.sa.
citc.gov.sa. 5 NS ns2.citc.gov.sa.
citc.gov.sa. 5 NS ns3.citc.gov.sa.
Authority
The response has no authority records.
Additional
ns1.citc.gov.sa. 5 A 86.111.194.61
ns2.citc.gov.sa. 5 A 86.111.194.60
ns3.citc.gov.sa. 5 A 86.111.197.60
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0