Apex domains cannot have CNAME records.
Question and response
Question
dig infobunker.com. NS
Answer
infobunker.com. 5 NS ns1.infobunker.com.
infobunker.com. 5 NS ns2.infobunker.com.
infobunker.com. 5 NS ns3.infobunker.com.
Authority
The response has no authority records.
Additional
ns1.infobunker.com. 5 A 208.71.33.1
ns2.infobunker.com. 5 A 208.71.33.2
ns3.infobunker.com. 5 A 208.95.0.169
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0