Apex domains cannot have CNAME records.
Question and response
Question
dig gabia.com. NS
Answer
gabia.com. 4 NS ns-1111.awsdns-10.org.
gabia.com. 4 NS ns-527.awsdns-01.net.
gabia.com. 4 NS ns.gabia.co.kr.
gabia.com. 4 NS ns.gabia.net.
gabia.com. 4 NS ns-214.awsdns-26.com.
gabia.com. 4 NS ns-1807.awsdns-33.co.uk.
gabia.com. 4 NS ns1.gabia.co.kr.
Authority
The response has no authority records.
Additional
ns.gabia.co.kr. 4 A 43.201.170.100
ns.gabia.net. 4 A 121.78.117.39
ns.gabia.net. 4 A 211.234.124.90
ns1.gabia.co.kr. 4 A 20.200.205.248
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0