Apex domains cannot have CNAME records.
Question and response
Question
dig wmhost.com. NS
Answer
wmhost.com. 2 NS ns1.wmhost.org.
wmhost.com. 2 NS ns3.wmhost.org.
wmhost.com. 2 NS ns2.wmhost.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0