Apex domains cannot have CNAME records.
Question and response
Question
dig gtek.biz. NS
Answer
gtek.biz. 5 NS ans1.gtek.biz.
gtek.biz. 5 NS ans2.gtek.biz.
Authority
The response has no authority records.
Additional
ans1.gtek.biz. 5 A 65.90.11.6
ans2.gtek.biz. 5 A 65.90.11.8
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0