Apex domains cannot have CNAME records.
Question and response
Question
dig lethalpig.com. NS
Answer
lethalpig.com. 5 NS ns1.lethalpig.com.
lethalpig.com. 5 NS ns2.lethalpig.com.
Authority
The response has no authority records.
Additional
ns1.lethalpig.com. 5 A 62.100.205.56
ns2.lethalpig.com. 5 A 62.100.206.8
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0