Apex domains cannot have CNAME records.
Question and response
Question
dig getway.biz. NS
Answer
getway.biz. 5 NS ns3.getway.biz.
getway.biz. 5 NS ns2.getway.biz.
getway.biz. 5 NS ns1.getway.biz.
getway.biz. 5 NS ns4.getway.biz.
Authority
The response has no authority records.
Additional
ns1.getway.biz. 5 A 81.171.17.217
ns2.getway.biz. 5 A 130.185.72.100
ns3.getway.biz. 5 A 195.248.242.94
ns4.getway.biz. 5 A 159.69.192.28
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0