Apex domains cannot have CNAME records.
Question and response
Question
dig recombo.com. NS
Answer
recombo.com. 5 NS ns2.webnames.ca.
recombo.com. 5 NS ns1.webnames.ca.
recombo.com. 5 NS ns3.webnames.ca.
Authority
The response has no authority records.
Additional
ns1.webnames.ca. 5 A 209.15.37.67
ns2.webnames.ca. 5 A 209.15.37.2
ns3.webnames.ca. 5 A 20.220.44.60
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0