Apex domains cannot have CNAME records.
Question and response
Question
dig enma.nsdhost.com. NS
Answer
enma.nsdhost.com. 5 NS enma.nsdhost.com.
Authority
The response has no authority records.
Additional
enma.nsdhost.com. 5 A 158.69.75.143
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0